If a dog eats weed, the THC in cannabis causes intoxication that can range from mild sedation and wobbliness to, in rare severe cases, seizures and breathing difficulty. Most dogs recover fully within 24 to 72 hours with supportive care, but the experience is frightening for both the dog and the owner, and veterinary attention is strongly recommended.
Signs of THC Intoxication in Dogs
Dogs are far more sensitive to THC than humans. Symptoms typically appear within 30 minutes to a few hours after ingestion, depending on whether the dog ate plant material, an edible, or butter/oil (which are absorbed faster because THC dissolves in fat).
The most common signs include:
- Wobbliness or stumbling (ataxia), often the first thing owners notice
- Extreme drowsiness or sedation, sometimes to the point where the dog can barely stand
- Dilated pupils and a glazed or “spaced out” look
- Urinary incontinence, meaning the dog dribbles urine without realizing it
- Startling or flinching at sounds and touch (hyperesthesia)
- Trembling or shaking
- Vomiting
- Slow heart rate or, less commonly, a fast heart rate
In more severe exposures, dogs can become unresponsive, have difficulty breathing, or develop seizures. A very small dog eating a potent edible is the highest-risk scenario because the dose per pound of body weight is much larger.
How Dangerous Is It?
THC actually has a wide safety margin in dogs. The minimum lethal oral dose is more than 3 g/kg of pure THC, which is roughly 1,000 times the dose that causes behavioral effects. In practical terms, it is extremely unlikely that a dog could eat enough marijuana flower to die from THC alone. Deaths that have been reported almost always involve edibles containing other toxic ingredients, or dogs that were already medically fragile.
That said, “not usually fatal” does not mean “not a big deal.” A dog stumbling around in a sedated haze can fall off furniture, choke on vomit, or aspirate fluid into the lungs. The intoxication itself is also genuinely distressing for the animal, who has no way to understand what is happening.
Edibles Carry Extra Risks
When the dog eats an edible rather than raw cannabis, the THC concern is only part of the picture. Many cannabis edibles contain ingredients that are independently toxic to dogs.
- Chocolate (brownies, cookies) contains theobromine, which can cause vomiting, rapid heart rate, muscle tremors, and seizures in dogs. Dark chocolate is especially dangerous.
- Xylitol (a sugar substitute found in some gummies and sugar-free baked goods) can cause a rapid, life-threatening drop in blood sugar and liver failure. Even small amounts can be deadly.
- Butter and oil in rich edibles can trigger pancreatitis, a painful inflammation of the pancreas that sometimes requires hospitalization on its own.
If your dog ate an edible, try to identify the ingredients. A weed brownie made with dark chocolate and a sugar-free gummy sweetened with xylitol are both emergencies independent of the THC content.
What to Do Right Away
Do not try to make your dog vomit if signs of sedation have already started. THC’s sedating effects can set in quickly, and a drowsy dog is at high risk of aspirating (inhaling vomit into the lungs), which can cause pneumonia or suffocation. Activated charcoal carries the same aspiration risk once symptoms are present.
If you catch the ingestion within minutes, before any symptoms appear, a vet may be able to induce vomiting safely. That window is short. Your best move is to call your veterinarian or an emergency animal hospital immediately and describe what the dog ate, roughly how much, and how long ago. If the clinic is far away, the ASPCA Animal Poison Control Center (888-426-4435) can guide you over the phone, though there is a consultation fee.
While getting help, keep your dog in a quiet, dimly lit space where they can’t fall off anything or get tangled in objects. Place them on a surface that’s easy to clean in case of vomiting or urinary incontinence. Do not offer food or water if the dog is very sedated, since they could choke.
What Happens at the Vet
There is no antidote for THC intoxication. Treatment is entirely supportive, meaning the vet manages symptoms while the drug works its way out of the dog’s system. This typically involves IV fluids to keep the dog hydrated and help flush the toxin, along with medications to control nausea, tremors, or agitation as needed.
For more severe exposures, vets may use a specialized fat-based IV solution called lipid emulsion therapy. Because THC dissolves in fat, this treatment helps pull it out of the body faster. In the most serious cases, dogs may need breathing support or anti-seizure medication, though this level of intervention is uncommon.
Most vets diagnose THC toxicity based on symptoms and the owner’s account of what the dog ate. Be honest with the vet. They are not going to report you, and knowing exactly what the dog consumed (including any chocolate, xylitol, or other ingredients) directly affects the treatment plan.
Recovery Timeline
Mild cases often resolve within 12 to 24 hours. The dog gradually becomes less wobbly, more alert, and starts acting like themselves again. Moderate to severe cases can take 48 to 72 hours for a full recovery, especially if the dog ate a large dose or a concentrated edible. THC is stored in fat tissue and released slowly, which is why effects can linger.
During recovery, your dog may seem “off” for a day or two even after the obvious signs fade. Appetite might be reduced, energy levels low, and coordination slightly impaired. This is normal and resolves on its own. If your dog is still showing significant symptoms after 72 hours, or if symptoms seem to be getting worse rather than better after the first 12 hours, that warrants another vet visit.
CBD Products vs. THC
If your dog got into a CBD product rather than marijuana or a THC edible, the risk profile is different. CBD is non-intoxicating and is well tolerated in dogs even at high doses. An acute overdose of up to 62 mg/kg caused only diarrhea in studied dogs. At most, a CBD overdose leads to digestive upset.
There’s a catch, though. About 30% of dogs in reported CBD exposure cases showed lethargy, and 21% were wobbly, which are signs more consistent with THC intoxication. The likely explanation is that many CBD products, particularly cheaper or poorly regulated ones, contain unlabeled THC or synthetic cannabinoids. If your dog ate a CBD product and is showing signs beyond mild stomach upset, treat it the same way you would a THC exposure.
Preventing Repeat Incidents
Dogs are attracted to cannabis products because of the smell and, in the case of edibles, the taste. Edibles made with butter are especially appealing. Store all cannabis products in sealed, dog-proof containers, ideally in a closed cabinet or on a high shelf. This includes discarded joints, roach clips, vape cartridges (which contain concentrated oil), and any infused foods.
With cannabis legalization spreading, veterinary emergency rooms are seeing a sharp increase in THC toxicity cases in dogs. Most of these are entirely preventable. Dogs will eat things they shouldn’t, so the responsibility falls on keeping products out of reach, the same way you would with medications or cleaning supplies.