CBD for dogs & cats: Effect, dose & safety
- Dogs have significantly more CB1 receptors in the cerebellum than humans – THC is toxic to them
- Cats: even slower THC metabolism than dogs – absolute contraindication for THC
- McGrath 2019 (RCT): CBD 2 mg/kg significantly reduced seizure frequency in dogs
The endocannabinoid system in animals
Not only humans have an endocannabinoid system (ECS) – all mammals, birds, reptiles and fish have CB1 and CB2 receptors. In dogs and cats, the ECS is very similar to the human one, which makes cannabis-based products interesting for veterinary applications. However, there are important differences in THC tolerance that must be taken into account.
THC: Dangerous for dogs and cats
Dogs are hypersensitive to THC. The reason: dogs have significantly more CB1 receptors in the cerebellum than humans and a slower metabolization. Even small amounts of THC can lead to severe intoxication in dogs:
Symptoms of THC intoxication in dogs:
– Ataxia (balance disorders, staggering)
– Mydriasis (dilated pupils)
– Bradycardia, hypothermia
– Urinary incontinence
– Tremor, cramps (at high doses)
– In rare cases coma
Cats metabolize cannabinoids even more slowly than dogs and are even more sensitive. CBD products for cats must be absolutely THC-free (<0.001%). This is especially true as cats, as obligate carnivores, have a reduced CYP450 capacity.
Safety rule: No THC for pets. Never. Not even full spectrum products with trace amounts of THC – the accumulated risk in small bodies is too high.
CBD in animals: What studies show
| Study | Animal/indication | Result |
|---|---|---|
| Gamble et al. 2018 (Front Vet Sci) | Dogs, osteoarthritis pain, n=16, CBD 2.5 mg/kg 2x daily | Significant pain reduction (CBPI score) and better mobility; no side effects |
| McGrath et al. 2019 (J Am Vet Med Assoc) | Dogs, epilepsy, n=26, CBD 2.5 mg/kg 2x daily | Significant reduction in seizure frequency in 89% of CBD dogs vs. 34% placebo; alkaline phosphatase increased |
| Polidoro et al. 2022 (Front Vet Sci) | Dogs, CBD pharmacokinetics | CBD well absorbed orally; lipid carrier oil significantly increases bioavailability |
| Bartner et al. 2018 (Can Vet J) | Dogs, CBD pharmacokinetics | CBD oil (MCT base): Cmax after 2h, half-life 4-5h; no toxicity at 0.5 mg/kg |
Areas of application for pets
Osteoarthritis and joint pain: best proven indication. Gamble 2018 shows significant improvement in dogs with osteoarthritis. Relevant in older dogs (>7 years) where joint degeneration is common.
Epilepsy: McGrath 2019 shows promising results, but phosphatase increase must be monitored For epileptic dogs in which antiepileptic drugs (phenobarbital, potassium bromate) fail, CBD can be a supplement.
Separation anxiety and stress: very common indications in practice. CBD has an anxiolytic effect via 5-HT1A – this receptor is also present in dogs. For fireworks, thunderstorms, visits to the vet: CBD 1-2 hours beforehand.
Loss of appetite and nausea: CB1 in the gastrointestinal tract of dogs modulates motility and nausea – analogous to humans. For chemotherapy-induced nausea in cancer dogs: CBD as a supportive measure.
Dosage: recommendations from studies and practice
| Animal species | Indication | Recommended dose |
|---|---|---|
| Dog | Osteoarthritis pain | 2-2.5 mg/kg 2x daily (from Gamble study) |
| Dog | Epilepsy | 2.5 mg/kg 2x daily (McGrath protocol) |
| Dog | Anxiety (acute) | 1-3 mg/kg 1-2h before stressor |
| Cat | Anxiety, pain | 0.1-0.5 mg/kg daily (start very conservatively) |
Important: Always discuss with a vet. CBD can increase alkaline phosphatase in dogs (McGrath 2019) – liver value checks every 3-6 months for long-term use.
Product selection: What to look out for
– Absolutely THC-free: <0.001 % THC – no full spectrum for animals
– Animal-friendly formulation: no xylitol (deadly for dogs), no essential oils
– COA (Certificate of Analysis): THC content independently confirmed
– Lipid carriers: MCT oil or sunflower oil increase bioavailability
– Do not use products for humans: Concentration often wrong for animal weight, flavorings harmful
CBD dosage guide - Cannabis quality
FAQ: CBD for dogs and cats
Summary
The ECS in mammals is very similar to that in humans – CBD also works in principle in dogs and cats. Gamble 2018 proves significant pain relief in osteoarthritis dogs, McGrath 2019 shows potential in epilepsy. Absolute ban: THC for pets. CBD selection: veterinary products, THC-free, COA-tested. Always discuss interactions with veterinary medication (phenobarbital, NSAIDs) with your vet.
