Let’s start with the reassuring part, because if you’re reading this in a hurry, you need it first: a dog who got into cannabis is very unlikely to die from the THC itself. Dogs have swallowed staggering amounts and walked away fine with supportive care. So take a breath.
Now the part that actually matters. The THC is rarely the thing that hurts your dog. Two other things are: what the THC was mixed with, and whether you tell your vet the truth. Get those two right and most of these cases end uneventfully. Get them wrong and a low-risk situation can turn into a genuine emergency. Here is everything you need to handle it well.
Why dogs get hit harder than we do
Cannabis plants contain hundreds of compounds, but the one behind the “high” is THC, which acts on cannabinoid receptors called CB1 and CB2. Dogs have both, and here is the key difference: they carry a far higher density of CB1 receptors in their brains than humans do. That is why the same dose that mellows a person can leave a dog wobbly, disoriented, and distressed. And it is not only edibles; dogs can absorb THC from secondhand smoke, though ingestion, plant material, joints, gummies, vape cartridges, capsules, is by far the more common route.
What THC toxicity looks like
Signs usually show up within an hour and can linger up to three days. The most recognizable ones include:
- Urinary incontinence: dribbling urine, a classic and oddly specific tell.
- Ataxia: an unsteady, drunken-looking gait, sometimes progressing to real difficulty walking.
- Hyperesthesia: heightened sensitivity, jumpiness at sounds or movement.
- Lethargy: drowsiness and low energy, with most dogs wanting to sleep it off.
- Dilated pupils and a distant, glassy stare.
- Disorientation: losing their sense of direction, unable to focus on surroundings.
Not every dog goes sleepy. Roughly a quarter tip the other way into agitation and hyperactivity. A drop in heart rate (bradycardia) is common too. In more serious exposures you may also see twitching, tremors, vomiting, drooling, vocalizing, seizures, dangerously slow breathing, or, rarely, coma.
One under-appreciated danger is temperature. THC interferes with a dog’s ability to regulate body heat by widening blood vessels, which can drop core temperature into hypothermia regardless of how warm the room is. Combined with low blood pressure and a slow heart rate, that is the mechanism behind the sickest cases.
The real hazard: bad company
Here is the thesis worth tattooing on your memory. A dog who ate plain plant material or a low-dose edible is usually in for an uncomfortable, sleepy day. A dog who ate a product is a different story, because the extras are often more dangerous than the THC.
Higher-risk exposures include:
- Large quantities of THC
- Potent concentrates such as hashish or wax
- Anything made with cannabis-infused butter, especially baked goods
- Chocolate edibles like pot brownies, where the chocolate is a separate poison
- Synthetic cannabis
- THC combined with other recreational drugs
That pan of THC brownies is a triple threat: the THC, the chocolate, and the fat-and-sugar load that can trigger vomiting and even pancreatitis. Watch too for xylitol and raisins in edibles, both of which are dangerous to dogs entirely apart from the cannabis. When you tell your vet what happened, the ingredient list is often more important than the THC.
Why honesty is the whole game
There is no antidote for THC. Treatment is supportive: monitoring, fluids, warmth, anti-nausea meds, seizure control if needed, and hospitalization for the severe cases. To choose the right level of care quickly, your vet needs to know what your dog ate and roughly how much. And they are not going to turn you in.
“The single biggest thing that slows down a good outcome is an owner who’s embarrassed to say what really happened,” says Dr. Amara Solis. “I’m not here to judge, and I’m certainly not here to call anyone. Just tell me it was a gummy and about how many milligrams, and we can skip an expensive fishing expedition and get straight to helping your dog.”
That candor saves money, saves time, and spares everyone the stress of untangling a mystery illness that isn’t a mystery.
What to do if your dog gets into it
- Don’t panic. Your dog most likely needs support, not heroics.
- Gather the facts. Your dog’s age and weight, symptoms and how long they’ve lasted; the product type (plant, edible, baked good) and dose if you know it.
- Call for guidance. Reach your vet or a poison hotline: ASPCA Animal Poison Control at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661. Both charge a consultation fee and give you a case number that any vet can use for follow-up support, even days later.
- Escalate if severe. If your dog is poorly responsive, seizing, or struggling to breathe, go to the ER immediately; poison control can advise while your dog is being treated.
- Support at home if cleared. If your vet okays home monitoring, keep your dog comfortable and away from stairs and sharp furniture edges, keep walks short, and steady them so they don’t fall.
What’s new since this was written
The trend line on cannabis and pets tells a striking story. As legalization spread, THC exposures in dogs climbed hard: the Pet Poison Helpline logged a 430% jump in marijuana-related calls between 2019 and 2023, and for years cannabis ranked near the top of its annual pet-poison list. Then, in 2024, something shifted. For the first time in six years the numbers actually fell, a 24.7% drop in marijuana calls year over year, which experts credit partly to owners getting more careful about storage as the novelty of legal weed wore off.
The other development worth knowing is delta-8 THC and the wave of hemp-derived, loosely regulated products it rode in on. These are widely available, vary enormously in potency, and are just as capable of poisoning a dog as traditional cannabis. The safety rule hasn’t changed, it’s only gotten more important: treat every cannabis product in your home, gummies, vapes, tinctures, and delta-8 snacks alike, as you would a bottle of pills, and lock it well out of reach.
References
- Pet Poison Helpline. “Top 10 Pet Poisons of 2024.”
- Merck Veterinary Manual. “Toxicosis in Dogs and Cats From Tetrahydrocannabinol (THC).”
- ASPCA Animal Poison Control Center. “Marijuana (THC) Toxicity in Pets.”
