1. What Is Phenobarbital For Dogs? 2. How Does Phenobarbital Work? 3. Common Causes Of Seizures In Dogs 4. Four main types of seizures 5. Side Effects Of Phenobarbital For Dogs 6. Side Effects 7. Drug Interactions With Phenobarbital 8. When To Stop Taking Phenobarbital 9. Alternatives To Phenobarbital For Dogs 10. CBD Phenobarbital is one of the most common prescribed medications for dog seizures. What if I told you there is a natural alternative, CBD.
A Complete Guide To Phenobarbital For Dogs
Phenobarbital is a fairly common prescription medication in humans and animals alike, used to treat seizures in younger children and pets. It can be administered orally or through an injection. It takes hold relatively quickly and the effects last for a few days. Phenobarbital works by helping control electrical activity that occurs during a seizure.
The majority of seizures are caused by abnormal electrical activity in your dog’s brain. Neurons begin misfiring, leading to spasmodic jerks and contractions throughout your dog’s body. Phenobarbital reduces the electrical activity of your pet’s brain, reducing the likelihood that they will have a seizure. Much less commonly, though, phenobarbital may also be used to help dogs with anxiety or sleep issues. These instances involve short term prescriptions, however, rather than long term use of the medication.
Phenobarbital is usually administered once per day, typically at night. It comes in both tablet and liquid form and should be administered with food if possible. In cases of dogs with more severe epilepsy, they may end up taking dosages twice per day.
It’s very important that once your dog begins taking phenobarbital that dosages are not missed. Missed dosages have a tendency to trigger epileptic episodes. Your vet
will need to be somewhat involved with your phenobarbital treatment, as low dosages can be ineffective, while high dosages can be toxic to your dog’s blood.
A seizure is an unexpected surge of neuron activity within your dog’s brain. It can affect the way your dog feels, behaves, and moves. Most commonly, a seizure will look like convulsing spasms that last for a couple of minutes. Occasionally, instead of convulsing, dogs will simply go unconscious. This will look like your dog is walking around, going about their day, and then out of nowhere, they collapse unconscious.
Phenobarbital works by suppressing the overall electrical activity of your dog’s brain. It’s effective in around 60% to 80% of dogs. If your dog’s brain activity is generally low, then even when it sparks due to epilepsy, it isn’t high enough to cause a seizure – this is the underlying concept of phenobarbital as well as most epileptic medications.
Phenobarbital is one of the more popular prescriptions for seizures due to its low cost and effectiveness. Despite the fact that phenobarbital is not FDA approved for use with dogs, still one of the first medications that veterinarians will recommend for epileptic dogs. It takes around two weeks of use for phenobarbital to begin taking effect in a dog since the levels of phenobarbital in your pet’s bloodstream need to reach a certain level.
If your dog is still having semi-frequent seizures after having been on phenobarbital for
more than two weeks, contact your veterinarian to discuss raising your dog’s dosage or possibly switching to a new medication.
Fortunately, seizures aren’t too common in dogs, only occurring in about 0.5% of all canines – or one in every two hundred dogs. Seizures are not a disease in and of themselves, but rather a symptom of another underlying issue. Sometimes this is
epilepsy, while other times factors like tumors, injuries, and unknown causes can be at the root of the issue.
These are the most common kinds of seizures in dogs, and unfortunately, they are the most dangerous. Grand Mal seizures affect your pet’s entire body, causing them to convulse and spasm. These seizures can last anywhere from a few seconds to several minutes and can be especially dangerous if happening back to back.
A focal seizure is one that occurs in a specific region of your dog’s body. They occur when the abnormal surge of electrical activity in a dog’s brain is local to a specific area. This causes the seizure to only affect one of your dog’s limbs or one side of their body.
Psychomotor seizures are seizures that affect your dog’s behavior rather than their bodily movements. You may notice that your dog is acting oddly, running around, chasing imaginary objects, and seeming to be on edge. In humans, psychomotor seizures can manifest themselves as night terrors, where an individual is in a dreamlike state while awake and moving around. Psychomotor seizures are harder to identify, especially in dogs.
Breeds prone to epilepsy
While any dog at any age can develop epilepsy, there are few breeds that have a higher predisposition for having epileptic episodes. Breeders are generally pretty good about removing epileptic dogs from the gene pool, but this doesn’t guarantee that epilepsy won’t be passed down through a breed.
Some of the breeds that most frequently experience epilepsy include:
Keep in mind that just because a particular breed of dogs is on this list, it doesn’t mean
that they are guaranteed to suffer from seizures. Seizures are still rare among these breeds, they just happen to be more common than in dogs in general.
Unfortunately, seizure medications tend to have some of the worst side effects for their users, and phenobarbital is no exception. Phenobarbital is what’s known as an “extra-label” drug. This means that it is approved for use on humans by the FDA, but not approved for use on animals. Veterinarians are allowed to use extra-label drugs
Sedation is the most common side effect of phenobarbital. This is because of the way that phenobarbital works. The medication suppresses your dog’s brain activity to reduce the likelihood that they will have a seizure. However, this also reduces their energy levels, causing them to be more lethargic and sedentary. If your dog is sedated while using phenobarbital, they may need to lower their dosage or switch to a different medication altogether. Sedation is also relatively common when a dog is just beginning to use phenobarbital. This is normal and expected, and should go away after the first few weeks of use. If your dog is still sedated after the first few weeks, however, consult with your vet about resolving the issue.
Phenobarbital can also cause your pet’s appetite and thirst to increase. An increased appetite can be dangerous, as weight gain is a serious health issue with dogs. Fortunately, this is relatively easy to manage since all you need to do is monitor and control their food intake. Excessive thirst is less problematic, though it can lead to an increase in your dog using the bathroom inside. If your dog is drinking more while on phenobarbital, you might need to take them outside more often than before.
On the other end of the spectrum, dogs taking phenobarbital may appear more restless and hyperactive. This may look like excessive activity, your dog becoming more vocal, panting even when your dog is inactive, and otherwise being high strung.
A more serious side effect of phenobarbital is liver damage. Long term use of phenobarbital (more than three months) can cause liver damage to occur to your dog. This can manifest in a variety of symptoms, including weight loss, jaundice, dark liver, and abnormal stools.
Phenobarbital and Liver Damage
Phenobarbital has been linked to liver damage in dogs that use the medication over a long period of time – more than three months. If your dog’s blood serum levels of phenobarbital are over 45 mcg/ml, then your dog is likely experiencing liver damage from phenobarbital. A healthy dosage of this medication should be around 30 mcg/ml. In order to make sure that your dog is getting the proper dosage of phenobarbital, check in with your vet every six months for new blood tests.
Damage to the liver by phenobarbital can cause scarring, liver disease, and possibly liver damage. While this tends to occur in a relatively small number of dogs, the potential risks are still there. If the damage is caught early enough, the damage can be reversed by reducing dosages or switching medications altogether. If the damage is not caught soon enough, though, it can become permanent and potentially fatal.
Being proactive is the best way to reduce the chances that your dog will experience severe liver damage from phenobarbital. Rather than waiting for symptoms of liver damage to occur, take your dog to the vet on a regular basis for bloodwork to make sure that their phenobarbital levels are still within a healthy range.
The earliest signs of liver damage involve issues related to your dog’s appetite. They may be excessively hungry or – on the opposite end – reluctant to eat. Dogs with liver issues might start losing weight as well and could drink more water than normal. Later on, more serious symptoms will start to surface, like jaundice, swollen stomach, dark brown urine, and lethargy. These later symptoms could indicate that your dog is experiencing liver failure.
The Risks Of Phenobarbital
Liver damage is one of the most serious risks of phenobarbital use in dogs. High dosages over a long period of time can overwork and poison the liver, eventually leading to severe health conditions – including liver failure. However, liver failure is not the only health condition that can arise from long term use of phenobarbital.
While it is effective for treating seizures, phenobarbital is a harsh drug and shouldn’t be given to your pet if they have any of the following conditions:
- Heart disease
- Respiratory issues
All of these existing conditions can be worsened through frequent phenobarbital use. When consulting with your vet, make sure that they are aware of any of these conditions that your dog may have, as well as any other conditions that aren’t mentioned on the list. There are plenty of alternative epilepsy treatments available, so there is no need to have your dog stuck on a harmful medication.
All of the issues that phenobarbital can create are entirely preventable. Frequent monitoring of your dog’s phenobarbital levels is a vital component of making sure that they are in good health while using this drug. Most of the symptoms of severe damage won’t surface until the damage is already permanent, so it’s better to err on the safe side and take precautions.
While it is possible for your pet to go into epilepsy remission, this takes several years, which means several years of phenobarbital therapy. Because of this fact, you need to ensure that it’s doing as little damage to their system as possible. If you are
unknowingly giving your dog a toxic dosage of phenobarbital for years and years without taking them to a vet, the damage will be irreversible.
Like any medication that your dog is on, drug interactions will need to be taken into consideration. If your dog is on any medication prior to being prescribed phenobarbital – whether it be prescription, over the counter, supplements, etc. – your vet will need to know what they are taking before you begin phenobarbital therapy.
Most notably, phenobarbital increases the activity of your dog’s liver. This means that medications that normally take effect by being broken down by the liver will likely be less effective. Depending on the medication, your vet may recommend that you increase the dosage of that medication or switch to something more potent.
On the other side of the spectrum, some drugs may become more effective or cause phenobarbital to become more effective when used in conjunction with one another. When this happens, your vet may recommend that you lower the dosage of each to bring things back down to a healthy level. There may also be times when phenobarbital simply isn’t an option because of the way it interacts with certain drugs, so if your dog is already on medications prior to visiting the vet about epilepsy, be prepared to be prescribed something other than phenobarbital.
The following medications are all likely to have interaction when taken alongside phenobarbital:
- Certain anticoagulants
- Estrogen agents
- Tricyclic antidepressants
- Opiate agonists
Keep in mind that this isn’t an exhaustive list of the medications that can interact with
phenobarbital, so you will still need to inform your vet of any current medications that your dog is taking before beginning phenobarbital therapy.
Not all dogs will need to take phenobarbital for the entirety of their lives. Many are able to enter epilepsy remission after just a few years of going through phenobarbital therapy. If you think that your dog may be ready to end their epilepsy treatment, consult with your veterinarian before taking them off of the medication. As mentioned earlier, unexpectedly taking your pet off of phenobarbital can result in a seizure. So consult with your vet and follow their directions on removing phenobarbital from your pet’s routine.
If your dog has been completely seizure-free for two to three years, they are a good candidate for ceasing phenobarbital treatment. This is especially true if your dog has been suffering from the side effects of the medication. If you’ve noticed that your dog has been having worse reactions to the drug while also not having had any seizures over a long period of time, then it is likely a good time to try taking a break from phenobarbital therapy.
There are instances other than when your dog is in epilepsy remission that you will need to consider ceasing phenobarbital treatment, and that’s usually when the side effects become so severe that your dog’s health is in danger. While this usually only occurs after improper dosing, some dogs simply aren’t able to handle the medication.
If you find yourself in a situation like this, where your dog is clearly suffering as after
having been on phenobarbital for a long period of time, speak with your veterinarian about switching to a milder prescription.
Phenobarbital is the go-to epilepsy prescription for several vets for a few reasons. Of course, the biggest reason is that it works. The majority of dogs will have a positive experience with phenobarbital treatment, so it’s a great option to start a dog on. It’s also inexpensive compared to many alternatives, which is important since the prescriptions usually last for a few years.
That said, there are dogs that simply aren’t compatible with this drug. Other prescriptions, preexisting conditions, and other factors might lead a vet to prescribe your pet another solution to epilepsy. Potassium bromide is a popular alternative to phenobarbital, especially in cases when your pet’s epilepsy is less severe. Like phenobarbital, it works by reducing the amount of activity in your dog’s brain, preventing seizures.
The major difference between the two drugs is that it takes much longer to build up the potassium bromide levels in your dog’s blood than it does to build up phenobarbital levels. This means that your dog might not experience any epileptic relief until four months of potassium bromide therapy. For this reason, phenobarbital and potassium bromide are often used in tandem with one another.
Levetiracetam is another potential alternative to phenobarbital. It’s a newer medication, but it is quickly gaining traction in the veterinary industry. However, because of its newness, there are still many unknown factors that vets are learning. An example of this is that vets are beginning to discover that dogs and cats seem to
develop a tolerance to levetiracetam after a period of time, resulting in an animal’s seizures making a comeback.
Another popular alternative to phenobarbital is CBD. CBD is relatively new as a supplement for several health conditions, but research throughout the medical field is extremely promising. CBD has numerous health benefits, one of which includes reducing the frequency of seizures.
In higher dosages,CBD can be used to reduce the frequency of seizures and even interrupt them as they are happening, with little to no side effects. Most dogs have a healthy tolerance to the supplement, and even those that don’t are only ever likely to experience a slight lethargy. It is important to keep in mind, though, that CBD is a relatively new supplement and shouldn’t be used without first consulting a vet. It is also less effective than traditional epilepsy treatments and will need to be delivered and relatively high dosages to make a difference in epileptic dogs. CBD works in dogs by stimulating your pet’s ECS system. This system is responsible for regulating several processes within your dog’s body, including things like appetite, mood, sleep, and immunity. When your pet takes CBD, it interacts with this system, causing it to work more effectively. The result is multiple positive changes in your animal’s health, as well as the overall homeostasis of your dog’s system. This homeostasis is the primary source of health benefits in dogs that routinely take CBD supplements.
Aside from treating epilepsy, CBD can also help reduce a dog’s anxiety, improve their mood, bring back their appetite, treat conditions like glaucoma and IBD, and lower the pain levels of conditions like arthritis.
Ivana Vukasinovic grew up in Serbia and attended the University of Belgrade where she received a degree in Veterinary medicine in 2012 and later completed surgical residency working mostly with livestock. Her first year of practice was split between busy small animal practice and emergency clinic, and after two more years of treating many different species of animals, she opened her own veterinary pharmacy where an interest in canine and feline nutrition emerged with an accent on fighting animal obesity. In her free time, she acts as a foster parent for stray animals before their adoption, likes to read SF books and making salted caramel cookies.
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The Innovet Team
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Dog Seizures: CBD vs. Phenobarbital
When it comes to controlling seizures in animals, there are many different options for pet parents to consider. One of the most commonly prescribed antiepileptic drugs used by veterinarians today is Phenobarbital.
Despite its widespread use, the side effects of phenobarbital are potentially devastating for pets. While it is relatively effective at keeping seizures at bay, PB is known to dramatically affect our pet’s quality of life by simultaneously putting significant strain on their liver.
As an alternative, CBD from a full spectrum hemp extract has powerful anti-epileptic properties. Research shows it is an effective way to control seizures in dogs while avoiding the numerous negative side effects associated with pharmaceutical drugs like Phenobarbital.
Table of Contents
What is Phenobarbital for Dogs?
Phenobarbital is part of the family of drugs called barbiturates, and can be found under various brand names such as Lumina, Solfoton and Tendral.
It was first synthesized for human use waaaaay back in 1911.
It is one of the oldest synthetic drugs still in wide use today. Initially, it was formulated as a hypnotic and sedative, but in February 1912, a young clinical assistant discovered it’s antiepileptic properties and the rest is history…
Since then, it has been widely used for humans and pets alike as an anti-epileptic, but not without its own set of side effects and risks.
How is it administered?
In most cases, phenobarbital for dogs is administered orally, once or twice a day. It comes in both tablet and liquid form, as well as intravenously at veterinary offices.
Various dosages are given based on a dog’s weight and the severity of seizures, among other factors, as sensitivity to this drug ranges quite a bit.
How does it work?
Phenobarbital works by suppressing electrical impulses within your pet’s brain and depressing the central nervous system. Think of it like turning down the volume on your car radio. Less energy through the system means less peaks on the high end.
‘Barbiturates’ like PB are metabolized primarily by the liver and secreted by the kidneys making them potentially problematic when combined with other drugs.
According to Dr. Zac Philossoph, phenobarbital takes a couple of weeks to reach stable blood concentration levels and may not be effective immediately. Consistency is especially important with this drug, as missed doses can result in a recurrence of seizures.
Depending on the case, there are varying degrees of effectiveness with this drug. It does not necessarily stop seizures altogether, in fact, Dr. Carla Johnson reports that in most cases it only reduces seizures frequency by 50%.
Seizures and Epilepsy
Seizures are caused by an excess of electrical energy in your dog or cat’s brain. CBD Dog Health’s chief veterinary officer, Dr. Zac Philossoph uses the analogy of seizures as a ‘brain sneeze’. That sounds cute, but seizures can be very scary.
When neurons begin misfiring and overactivating, it can cause all the hallmarks of a seizure.
- Spasmodic jerks throughout the body
- Loss of motor function
- Loss of consciousness
Dog seizures happen for a range of reasons. Some occur because of structural damage to the brain, some because of interactions with elements in our dogs’ environment. In addition, some breeds are just more prone to seizures than others.
Classification of seizures is done a couple of ways. First, seizures are classified with regard to the underlying cause of the seizure.
What Causes Dog Seizures?
The first thing veterinarians will define is the catalyst for epileptic events. This is meant to define the origin of the episodes whether it be internal or external forces.
- Structural seizures are due to primary brain disease (e.g. degenerative disease, brain tumor, stroke).
- Idiopathic epilepsy is subdivided into proven-genetic (breed-related), suspected-genetic, and epilepsy of unknown origin.
- Reactive seizures are due to metabolic, systemic or other non-primary brain disease.
In many cases seizures are caused a combination of underlying conditions and external factors:
- Kidney disease
- Liver disease
- Vascular disease
- Traumatic injury to the head
- Electrolyte imbalance
- High or low blood sugar
Breeds Prone to Epilepsy
Breeds such as Australian Shepherds, Beagles, Belgian Tervurens, Border Collies, Collies, German Shepherds, Labrador Retrievers, Cavalier King Charles Spaniels , Dachshunds , English Springer Spaniels , Finnish Spitz , Irish Wolfhounds , Lagotto Romagnolos , Petit Basset Griffon Vendeens , Shetland Sheepdogs , Standard Poodles and Vizslas are more genetically predisposed to experiencing seizures than other breeds.
Types of Seizures
According to the International Veterinary Epilepsy Task Force , there are three main types of seizures in animals:
- Generalized Seizures
- Myoclonic Seizures
- Focal Seizures
This class of seizure is often known as a Gand Mal seizure. They involve both cerebral hemispheres, and usually result in a loss of consciousness.
Similar to generalized seizures, but does not usually result in unconsciousness. These seizures are typically caused by stimuli like light or sound. They can also be a result of underlying structural damage in the brain.
Focal seizures usually do not result in unconsciousness. They typically only affect one hemisphere in the brain and present as subtle changes in behavior, like twitching, absent-minded chewing or loss of balance. Focal seizures often precede more serious degenerative patterns that cause more generalized seizure activity.
According to Dr. Michelle Carnes, “Our [epileptic] patients may experience focal seizures prior to developing generalized seizures; they just probably go unnoticed,”
An Alternative to Phenobarbital…
CBD from a full-spectrum hemp extract!
Since hemp became federally legal in 2018, a lot of research has been done to explore the efficacy of CBD as a treatment for epilepsy. Aside from thousands of anecdotal cases where seizures were treated with cannabis, we now have clinical research that confirms those findings.
In a 2017 double-blind study conducted by Colorado State University , 89% of dogs who received CBD in the clinical trial had a reduction in the frequency of seizures. Additionally, they saw a significant association between the degree of seizure reduction and the amount of CBD concentration in the dog’s blood.
This was not the only study to find CBD to be a successful anti-epileptic supplement for pets. Yamazaki University of Animal Health Technology in Japan conducted a similar experiment with great results.
In addition to these clinical trials, holistic pet cannabis expert, Angela Ardolino has treated hundreds of animals on her rescue, Fire Flake Farm.
In a recent interview, she talked about one of her rescue’s journey.
“We had an 18-year-old Chihuahua who had been experiencing multiple grand mal seizures a day, but 100 mg of the HEAL full spectrum hemp extract tincture from CBD DOG Health every day kept them at bay. Along with reducing her dementia, increasing her energy, focus and appetite”.
Daisie was fed a well rounded raw and fresh diet as well as getting daily applications of Soothe salve on her yeasty paws. With great pride Angela says, “After a month, you would hardly recognize this dog!”
Side Effects of Phenobarbital
When our pets have seizures the first thing we are concerned about is their safety and comfort. The last thing we want to do is cause them more discomfort or put them in danger, but with drugs like PB that is often the unintended consequence of long-term use.
As we’ve discussed, the main way that phenobarbital works is by suppressing electrical energy in the brain. One of the clear results of this mechanism is it reduces the mental function of our pets. They are commonly reported to be tired, slow and almost depressed looking. Where quality of life is concerned, this is a big loss.
Pet parents commonly see their dogs gaining a lot of weight while taking phenobarbital. Not only does this affect their quality of life, but it can also cause a domino effect in other areas of their health and well-being.
Polyuria, or excessive urination is caused by the increased thirst drive in dogs who take PB. When your dog or cat is taking this drug, it is not uncommon to find messes around the house.
Especially in the beginning, many dogs who are treated with Phenobarbital experience vomiting and an upset stomach. Typically this diminishes after a couple weeks of treatment.
Neurotoxicity in Younger Animals
Phenobarbital is not recommended for younger animals as clinical research indicates it has neurotoxic effects and can be extremely detrimental to cognitive development. Suppression of brain function sounds bad for any animal, but it is especially detrimental to developing brains.
One of the most significant side effects that dogs experience when treated with Phenobarbital is stress, and eventual damage to the liver. In most cases, long term damage occurs after the three months mark. It can start with scarring of the liver and end with significant loss of liver function, depending on how closely they are monitored by your veterinarian.
In the majority of dogs, a serum PB concentration between 25−30 mg/l is required for optimal seizure control. Serum concentrations of more than 35 mg/l are associated with an increased risk of hepatotoxicity and should be avoided.
Phenobarbital has been linked to raised levels of several liver enzymes that are used as markers to indicate liver damage (ALP, ALT, GGT). The significant anomalies in these levels indicate that the liver is working overtime to process the drug.
Side Effects of CBD for Dog Seizures
CBD is known for its high level of efficacy with seizure control as much as it is for the safety of its use. There is a significant amount of research that points to the safety of CBD as a way to help our pets, even at extremely high doses well above the normal recommended levels.
Many critics of CBD will point to one study which suggests that the use of CBD can lead to a rise in one particular liver enzyme, APL. According to experts in the veterinary field like Dr. Gary Richter DVM, this is not a significant rise and should be looked at as insignificant.
It is worth mentioning that there are multiple other studies which do not show any increase in liver enzymes like ALP for dogs treated with CBD from a full-spectrum hemp extract.
What we do know is that the minimal rise in liver enzymes from CBD is nothing compared to the significant levels seen in dogs treated with phenobarbital. CBD is not known to cause liver damage, but it is processed by the liver.
Phenobarbital Interactions With Other Drugs
Along with the numerous side effects and potential damage to the liver, Phenobarbital can have dangerous interactions with a long list of drugs. If you are using Phenobarbital for your dog, consider the limitations associated with its relationship to other treatments.
Avoid phenobarbital in combination with these drugs.
*Note* This is not an exhaustive list.
- Some Anaesthetics
CBD Interaction with Other Drugs
Though CBD’s interaction with other drugs still requires more clinical review, it is widely believed to be incredibly safe and stable with most commonly prescribed pharmaceuticals.
That being said, CBD is just one part of many in a complex relationship between compounds interacting in a full-spectrum hemp extract. Depending on the drug, it is possible that CBD may increase or decrease potency of another drug, or have no effect at all. It is always a good idea to consult with your holistic vet to find out how CBD may interact with drugs your pet is already taking.
For more information about drug interactions with CBD, check out this article !
When given the choice between Phenobarbital and CBD for the treatment of seizures, the most important thing to consider is quality of life. Our goal in the first place when trying to reduce seizure intensity and frequency is to make our dogs feel better.
The issue with so many of these conventional pharmaceutical drugs is you replace one problem with a whole set of others that can end up being even more detrimental than the ones you started with.
Though the effects may not be immediately as effective with a holistic approach, you can be confident that the effects will be better tolerated and more supportive of your pet’s wellness and longevity.
Father of a bulldog, Moo, Carter is a life-long animal lover from Toronto, Canada currently residing in Brooklyn, NY. Growing up in a family of veterinarians, he grew up surrounded by animals. He had dogs, cats, rodents, reptiles — you name it, and Carter probably rescued it. Carter’s passion for cannabis activism started when he was in high school. After learning about the senseless prohibition and incredible diversity of cannabis’s utility, he was inspired to get involved. When Carter met Angela, he was excited to learn that he could combine his passions: animals and cannabis. Carter now travels North America to educate pet parents, retailers, and veterinarians about CBD. He is excited to bring his passion for pets to CBD Dog Health.