CBD for pets - how do oils support dogs, cats, and horses?

CBD oils reached veterinary clinics faster than research could keep up, and this is where most of the confusion around dosing comes from. Some of the numbers circulating in caregiver guides do not come from any scientific work, and some are copied from studies that said something different. This text is based solely on published protocols: it provides doses exactly as used in studies on dogs, cats, and horses, along with the timing of administration and duration of observation. You will also find what studies have not confirmed, as the lack of evidence in animal supplementation can be more important than evidence. All decisions about administering a product to a chronically treated animal should be made with the attending veterinarian.

KEY INFORMATION
• The best-documented protocol for dogs is 2 mg of CBD per kilogram of body weight every 12 hours for 4 weeks, used in degenerative joint disease.
• In drug-resistant epilepsy, a dose of 2.5 mg/kg twice daily reduced the median seizure frequency by 33%, but the percentage of dogs with a 50% improvement did not differ from placebo.
• A cat at the same dose of 2 mg/kg achieves a significantly lower concentration in the blood than a dog (43 versus 301 ng/ml), so it is not a species that requires smaller doses due to overdose.
• Increased alkaline phosphatase activity appears in most studies on dogs, which is why monitoring liver function tests is part of the protocol, not an unnecessary precaution.
• In a study on healthy dogs, no significant pharmacokinetic interaction between CBD and phenobarbital was found.

Do dogs and cats have an endocannabinoid system?

Yes. Dogs and cats have cannabinoid receptors CB1 and CB2 and produce their own endocannabinoids, just like humans. CB1 predominates in the nervous system, while CB2 is found in immune cells and peripheral tissues. This is why the same molecule elicits a response in them, although it may not provoke the same reaction as in humans.

However, the species difference that has practical significance lies not in the receptors but in pharmacokinetics. A comparative study included eight dogs and eight cats receiving the same preparation at a dose of 2 mg/kg every 12 hours for 12 weeks. After a single administration, the maximum serum concentration was 301 ng/ml in dogs and 43 ng/ml in cats, with the area under the curve being 1297 and 164 ng-h/ml, respectively, and the time to maximum concentration was 1.4 and 2 hours. The authors summarize this in one sentence: cats absorb or eliminate CBD differently than dogs and achieve lower serum concentrations.

It is worth remembering the direction of this difference, as it is sometimes reversed in guides. A cat at the same dose has less substance in the blood, not more. A separate issue is the tolerance of the administration itself: in the same study, cats reacted to the oil with excessive licking and head shaking. Those who want to trace which species this system occurs in can find it in the text about the evolution of the endocannabinoid system.

In what problems has CBD been studied in animals?

Evidence from controlled studies exists for two indications in dogs: pain in degenerative joint disease and drug-resistant epilepsy as an adjunct therapy. Everything else, including separation anxiety, sound phobias, motion sickness, and geriatric support, is based on caregiver observations and clinical practice, not on randomized studies.

In degenerative joint disease a randomized, blinded study with a placebo group (Gamble et al., 2018) showed a significant reduction in pain and an increase in activity on the Canine Brief Pain Inventory and Hudson Activity Score scales, as well as less pain in the veterinarian's assessment. Caregivers reported no adverse effects, while biochemical testing showed an increase in alkaline phosphatase activity.

The second study added CBD administered mucosally to an existing pain relief protocol that included an anti-inflammatory drug, gabapentin, and amitriptyline. In the group receiving CBD, the pain severity score was significantly lower after one week, after two weeks, and after four weeks, and the pain impact score on functioning was lower after one week, after two weeks, and after twelve (Brioschi i in., 2020). The group consisted of nine dogs, so the result is promising but not conclusive, as the authors state directly.

In epilepsy, the picture is mixed, and this is more important information than the mere fact of improvement. I discuss the result in the section on interactions, as it has direct implications for treatment decisions.

Jakie dawki CBD stosowano psom w badaniach?

Two doses are covered in published protocols: 2 mg per kilogram of body weight every 12 hours for joint pain and 2.5 mg/kg twice daily in epilepsy as an adjunct therapy. The table below is a simple conversion of both protocols to body weight, not a therapeutic recommendation. The twelve-hour interval is not coincidental: in the pharmacokinetic study preceding the clinical part, the half-life was 4.2 hours and was the same at a dose of 2 mg/kg and at four times higher 8 mg/kg.

The conversion to drops is based on the contents of the bottle, not the percentage concentration on the label. A 5% preparation in a 10 ml bottle contains about 500 mg CBD; with a standard 200 drops in such a bottle, one drop is about 2.5 mg. At a concentration of 10%, one drop is about 5 mg. A dog weighing 20 kg in the 2 mg/kg protocol therefore needs about 16 drops of the 5% preparation or 8 drops of the 10% preparation at a time.

If you want to start with a dose lower than the research protocol, it is justified as a precaution, but it should be noted that efficacy has been studied for the values in the table. The upper safety limit is much higher: in an escalation study on healthy beagles, the preparation with a predominance of CBD was administered up to about 62 mg/kg and was found to be as safe as a placebo, with 94.9% of reported adverse effects being mild. dosage chart by weight shows these conversions over a wider range of body weights.

Why is a cat not a small dog?

Because at the same dose per kilogram, a cat has significantly less substance in its blood than a dog, and at the same time, it tolerates the administration of oil worse. These are two distinct differences, and most guides confuse them, recommending doses for cats reduced by several dozen percent without providing a source for such a conversion.

The only published long-term protocol for cats used the same dose as for dogs: 2 mg/kg every 12 hours for 12 weeks. Hematology and biochemistry did not show clinically significant changes, although one cat maintained elevated alanine aminotransferase levels throughout the study (Deabold i in., 2019). The following values are the same protocol converted to the body weight of a cat. There is no published study that has tested a lower dose in cats, so any value lower than the one given is a precaution of the caregiver, not a protocol with studied efficacy.

An escalation study on twenty healthy cats (Kulpa et al., 2021) allows estimating the safety margin. Increasing doses were brought up to 30.5 mg/kg CBD in all animals, all adverse effects were mild and transient, and more serious symptoms, such as apathy, hypothermia, ataxia, and third eyelid prolapse, occurred with preparations containing THC, not with CBD alone. Gastrointestinal complaints were more often associated with the MCT carrier.

What is the difference between a product for animals and a product for humans?

Three things: the absence of toxic ingredients for animals, controlled THC content, and a concentration adjusted so that it is possible to measure a few milligrams, not several dozen. The first is absolute, while the other two are matters of convenience and precision.

Xylitol must not be found in anything that goes to a dog, as it causes a rapid drop in glucose levels and liver damage. Essential oils, especially peppermint, eucalyptus, and tea tree oil, primarily affect cats because their liver struggles with phenolic compounds. Garlic and onion, which damage red blood cells, and cocoa due to theobromine, should also be added to the list of excluded ingredients.

THC is a separate matter, and it is THC, not CBD, that is responsible for most severe symptoms in studies. In the escalation study on dogs and in a similar study on cats, moderate and severe adverse events, such as apathy, hypothermia, and ataxia, were concentrated in groups receiving preparations with THC (Vaughn i in., 2020). The preparation with a predominance of CBD performed in this comparison like a placebo.

A preparation intended for humans can be given to a dog if it does not contain flavors, sweeteners, or additives from the above list, and its composition is documented by laboratory analysis. We outlined the criteria for evaluating such documentation in the text about how to distinguish a good oil from a poor one, how to distinguish a good oil from a poor one.

How to give oil to a dog or cat?

The simplest way is to apply it to the mucous membrane of the oral cavity, that is, on the gums or under the tongue, and this is how the preparation was administered in the study on joint pain in dogs. Administration with food is permissible when the animal resists, but then you lose control over how much has actually been taken.

1. Measure the dose with a dropper out of the animal's reach so it does not associate the bottle with a struggle.
2. Approach from the side, not from above, and gently lift the lip.
3. Apply drops to the gum or under the tongue, not deep into the throat.
4. Leave the animal alone for about a minute and do not offer water during this time.
5. Repeat after 12 hours if you are following the protocol twice a day.

The form of the preparation matters for absorption. In a study comparing three methods of administration in thirty healthy dogs, namely microencapsulated granules, oral oil, and transdermal cream, the highest systemic exposure was provided by the oral oil (Bartner i in., 2018). Exposure increased proportionally to the dose, and the half-life ranged from about two to over three hours, depending on the dose size.

If a cat reacts to the oil by licking and shaking its head, this behavior has also been noted in clinical studies and does not indicate poisoning. Usually, it is enough to change the timing of administration or spread out the dose, and in cases of persistent reluctance, it is better to consult a veterinarian for a different form of the preparation rather than increasing the holding strength.

Does CBD work in horses?

Data on horses is significantly more limited than on dogs, and the authors of pharmacokinetic studies themselves state that further research is needed before recommending CBD as an anti-inflammatory medication for this species. However, there is one clinical study with a control group that provides a specific, verifiable dose.

Pharmacokinetics were described in thoroughbred horses in training, which were administered a single dose of 0.5, 1, or 2 mg/kg of CBD suspended in sesame oil (Ryan i in., 2021). The preparation was well tolerated, with no significant behavioral disturbances, gastrointestinal issues, or heart problems. The half-life was approximately ten hours for each of the three doses. The impact on inflammatory markers was ambiguous.

The clinical study involved twenty horses with mild degenerative joint disease. Both groups received phenylbutazone for five days, and the experimental group additionally received 0.03 mg/kg of CBD in hemp oil once daily for fourteen days (Interlandi i in., 2024). In the CBD group, heart and respiratory rates decreased, leukocyte counts dropped, and the oxidative stress index was lower, while the chronic pain score for the horse was lower than in the control group (median 3 versus 7).

Note the dosage scale. For a horse weighing 500 kg, 0.03 mg/kg translates to 15 mg daily, which is less than the single dose for a ten-kilogram dog in a pain relief protocol. Transferring dog dosage conversions to horses yields values detached from the only clinical study we have.

When should CBD not be administered to an animal?

During pregnancy and lactation, in cases of severe liver failure, and in the perioperative period. In the first two situations, the reason is the lack of safety data, rather than proven harm, and this distinction is worth maintaining in discussions with a veterinarian.

The liver deserves a separate paragraph here, as the signal recurs in almost every study. An increase in alkaline phosphatase activity was noted in dogs with degenerative joint disease, in dogs with epilepsy, and in healthy beagles at daily doses ranging from 10 to 20 mg/kg, where values reached from 301 to 978 U/l. In one cat in a twelve-week study, elevated levels of alanine aminotransferase persisted. Practical conclusion: before starting and after several weeks of use, perform liver function tests.

Symptoms of administering too high a dose include drowsiness, ataxia, diarrhea, and apathy. In an escalation study in dogs, nearly all had mild severity, and with preparations containing THC, there were additional symptoms of hypothermia and noticeable balance disturbances. If a dog ingests a THC-containing preparation, contact with a veterinary clinic is urgent, as THC is responsible for severe neurological symptoms, not CBD.

The critical review by the WHO Expert Committee states that CBD is generally well tolerated and has a good safety profile, and reported adverse effects may result from interactions with other medications taken (WHO ECDD, 2018). The document pertains to humans and laboratory models, so it does not replace veterinary data.

Does CBD interact with veterinary medications?

The most frequently repeated warning concerns phenobarbital, and it does not find confirmation in the study that examined it. In a three-phase pharmacokinetic study involving nine healthy beagles, no significant differences were found in the pharmacokinetic parameters of either CBD or phenobarbital when administered together (Doran i in., 2021). The authors do not recommend changing the doses of either medication based on this.

However, the same study provided a warning of another kind. With chronic administration of CBD, mild gastrointestinal symptoms occurred in five dogs, five experienced hypoxia at daily doses ranging from 10 to 20 mg/kg, and four showed an increase in alkaline phosphatase. Therefore, the risk is liver overload at high doses, not a shift in the concentration of the antiepileptic drug.

The effectiveness in epilepsy requires an honest description. In a randomized study where twenty-six dogs with idiopathic epilepsy received 2.5 mg/kg twice daily for twelve weeks as an adjunct to their existing treatment, the median seizure frequency decreased by 33% compared to placebo, but the percentage of dogs with at least a fifty percent improvement was similar in both groups (McGrath i in., 2019). Dwa psy wycofano z powodu ataksji.

The conclusion for the caregiver is practical. CBD is not a substitute for antiepileptic medication and should never be discontinued independently. If you want to understand the difference between hemp seed oil and an extract-based preparation, we explain it in the text. olej z konopi kontra olejek CBD.

What does Polish law say about hemp products for animals?

Polish law does not recognize the category of hemp preparation intended for animals. There is no registered veterinary medicinal product containing CBD, so the oil administered to a dog or cat remains formally an over-the-counter product, used at the caregiver's responsibility, preferably after consulting with a veterinarian.

The basis regarding the raw material is, however, unequivocal. According to Article 4 point 5 of the Act of July 29, 2005 on Counteracting Drug Addiction (Journal of Laws 2023, item 1939), as amended the Act of March 24, 2022 (Dz.U. 2022 poz. 763)., fiber hemp refers to plants in which the sum of delta-9-THC and tetrahydrocannabinolic acid does not exceed 0.3% when calculated on a dry mass basis, rounded to one decimal place. The threshold is calculated as the sum of both compounds, not just delta-9-THC, and this distinction alters the result of laboratory testing. Until May 6, 2022, the value was 0.20%.

The national threshold corresponds to the EU threshold, but it does not derive from it, as these are two separate regulations with the same numerical value. The EU value of 0.3% for hemp varieties eligible for agricultural support was introduced by Regulation (EU) 2021/2115, applicable from January 1, 2023.

Cannabidiol itself does not appear on any list of controlled substances. HHC, however, is a controlled substance in Poland, and a preparation containing this compound should not be near an animal or human outside the provisions of the law.

Frequently Asked Questions

How long does it take to see the effects of CBD in a dog?

In the study on joint pain, a significant improvement was noted after two weeks of administration, and in the study with polypharmacy, already after one week. There is no basis to expect an effect after a single administration, which is why the research protocols lasted from four to twelve weeks.

Can I give my dog oil intended for humans?

Yes, if the product does not contain xylitol, flavorings, essential oils, or ingredients such as garlic and cocoa, and its composition is confirmed by laboratory analysis. The THC content is more significant than the CBD concentration itself, as THC is responsible for severe neurological symptoms in dogs.

Does CBD cause addiction in animals?

There is no data indicating such a mechanism. A critical review by WHO states that there are no signs of addictive potential in humans, and in animal models, no development of tolerance to CBD or substitution of THC has been observed. This document does not record studies on physical dependence in companion animals.

What to do if a dog eats an entire bottle of oil?

Contact the veterinary clinic and provide the composition of the product. With a product dominated by CBD, expect drowsiness, ataxia, and mild diarrhea. If the product contained THC, contact is urgent, as THC is associated with hypothermia and noticeable balance disturbances.

Can CBD be given together with phenobarbital?

A pharmacokinetic study in healthy dogs did not show significant interaction between these substances and does not recommend adjusting doses based on this. The decision is still made by the attending veterinarian, as high daily doses of CBD increased alkaline phosphatase activity and gastrointestinal symptoms appeared.

Does a cat need a smaller dose than a dog?

The only published long-term protocol used the same dose of 2 mg/kg for cats as for dogs. A cat achieves a significantly lower serum concentration at this dose, so the common principle of reducing the dose by several dozen percent is not supported by data. A cautious start is reasonable, but establish it with your veterinarian.

We have gathered products intended for animals in the category for animals, and administering them to a chronically treated animal should always be preceded by a conversation with a veterinarian.

This article is for informational and educational purposes only and does not constitute medical advice. Before starting to use hemp or CBD for therapeutic purposes, consult your doctor, especially if you are taking other medications, are pregnant, or breastfeeding.

Author: Michał Waluk · Opublikowano: 2026-05-06 · Aktualizacja: 2026-08-10