Hemp is not considered highly toxic to cats, but it’s not entirely safe either. The plant belongs to the same species as marijuana (Cannabis sativa), and while hemp is bred to contain very low levels of THC, it still contains compounds that can cause uncomfortable and sometimes concerning symptoms in cats. The risk depends heavily on what part of the hemp plant your cat encounters and whether it contains THC, CBD, or neither.
Why Hemp Affects Cats Differently Than Humans
Cats are more sensitive to cannabinoids than people are. Their smaller body size means even trace amounts of THC can produce noticeable effects. In a study where cats were given 41.5 mg/kg of THC oil, they developed lethargy, loss of coordination, hypothermia, gastrointestinal upset, and elevated third eyelids (that membrane you sometimes see partially covering a cat’s eye). All the cats in that study recovered without treatment, but those are significant symptoms from a single exposure.
A lethal dose of THC for cats has never been established, which means researchers haven’t found a threshold where it becomes fatal. That’s somewhat reassuring, but it doesn’t mean large exposures are harmless. Cannabis intoxication cases reported to the US Animal Poison Control Center involve cats about 3% of the time, with dogs making up 96%. Cats are less likely to eat plant material or edibles than dogs, but it does happen.
Hemp Seeds, CBD Oil, and Raw Plant Are Not the Same
The word “hemp” covers a lot of ground, and the risk to your cat varies depending on which hemp product is involved.
- Hemp seed oil is pressed from the seeds of the hemp plant. It contains no CBD and no meaningful amount of THC. It’s essentially a fatty acid supplement, similar to flaxseed oil. This is the lowest-risk hemp product for cats.
- CBD oil is extracted from the leaves, flowers, and stalks of the hemp plant. It contains cannabidiol and potentially trace amounts of THC (legally up to 0.3%). CBD can cause side effects in cats, including drooling, excessive licking, pacing, gagging, and elevated liver enzymes.
- Hemp extract is a broad term for any oil pulled from the hemp plant (excluding seeds). It may contain CBD, other cannabinoids, and terpenes in varying concentrations. Without clear labeling, you won’t know exactly what’s in it.
- Raw hemp plant material contains a mix of cannabinoids, terpenes, and plant fiber. If your cat chews on a hemp plant, it’s getting an unpredictable dose of multiple compounds at once.
Symptoms to Watch For
If your cat has eaten part of a hemp plant or gotten into a hemp product, the most common signs include lethargy, wobbling or unsteady movement, dilated pupils, and a visible third eyelid. Some cats drool excessively, vomit, or refuse food. In more significant exposures, you might notice a drop in body temperature or an unusually slow heart rate. These symptoms typically appear within 30 minutes to a few hours after ingestion.
Most cats recover on their own within 12 to 24 hours from minor exposures. But if your cat is stumbling, unresponsive, or vomiting repeatedly, a vet visit is warranted. There’s no antidote for cannabinoid exposure in cats. Treatment is supportive: keeping the cat warm, hydrated, and monitored until the compounds clear their system.
The Problem With Hemp Products for Pets
No CBD or hemp-derived product has been approved, conditionally approved, or indexed by the FDA for use in animals. That’s not just a technicality. It means these products haven’t gone through the safety and effectiveness testing that would tell us exactly how they affect cats at specific doses over time.
The FDA has acknowledged significant data gaps surrounding CBD and other cannabis-derived products in animals and has actively solicited information from veterinarians about usage trends, adverse events, drug interactions, and toxicological concerns. In practical terms, this means the hemp supplement market for pets is largely unregulated. Products vary widely in what they actually contain versus what the label claims.
Some CBD oil formulations made with medium-chain triglyceride (MCT) oil as a carrier have been specifically linked to side effects in cats. MCT oil on its own can cause digestive issues in felines, so even a “pure” CBD product may cause problems depending on its inactive ingredients.
What This Means If You Have Hemp at Home
If you grow hemp plants or keep hemp products around the house, treat them the way you’d treat any substance your cat shouldn’t freely access. Store oils and tinctures in closed cabinets. If you’re growing plants, keep them in a room your cat can’t reach. Cats are less prone to eating random plant material than dogs, but curious cats do nibble on greenery, and dried hemp flower or leaves left out could be tempting.
If you’re considering giving your cat a hemp or CBD product for anxiety, pain, or another health issue, the honest reality is that the safety data isn’t there yet. Some pet owners report benefits, but without standardized dosing, regulated products, or long-term safety studies in cats, you’re working with a lot of unknowns. The elevated liver enzymes seen in some studies are particularly worth noting, since liver stress in cats can escalate quickly and isn’t always obvious from the outside.