If your dog ate an edible, it will likely experience THC toxicity, which can look alarming but is rarely life-threatening. Symptoms can start within 30 minutes and last up to 72 hours, though most dogs recover fully within one to two days. The bigger danger often isn’t the THC itself but other ingredients in the edible, particularly chocolate or the sugar substitute xylitol.
Why Dogs React So Strongly to THC
Dogs have a significantly higher density of cannabinoid receptors in the hindbrain compared to humans. This means THC hits their nervous system harder and faster, even in small amounts. A dose that would barely register for an adult human can send a dog into a visibly distressed state. Dogs can develop mild symptoms from as little as 0.3 to 0.5 mg of THC per kilogram of body weight, and moderate to severe signs at doses above 2 to 3 mg/kg.
To put that in perspective, a single edible gummy containing 10 mg of THC could cause noticeable symptoms in a 30-pound dog and moderate toxicity in a smaller breed. The actual lethal dose of THC in dogs is extremely high, exceeding 3 grams per kilogram of body weight, and death from THC alone is exceptionally rare. No published lethal-dose data even exist because it happens so infrequently. That said, severe cases still require veterinary care to keep the dog safe and comfortable.
What Symptoms Look Like
Signs typically appear within 30 minutes to a few hours after ingestion. The most common is a wobbly, uncoordinated walk that can make your dog look drunk. Other signs include:
- Lethargy or stupor: your dog may seem “out of it,” unresponsive, or excessively sleepy
- Dilated pupils and a glazed, unfocused look
- Urinary incontinence: dribbling urine without seeming to notice
- Exaggerated startle responses: flinching or trembling at normal sounds
- Vomiting or drooling
- Slow heart rate or low body temperature
In more serious cases, dogs may have tremors, become agitated, or in rare instances experience seizures. Symptoms can persist for up to 72 hours in severe exposures, though for most dogs the worst passes within 12 to 24 hours.
The Hidden Danger: Other Ingredients
THC gets all the attention, but the other ingredients in an edible can pose a greater risk. Chocolate edibles carry the added toxicity of theobromine, which dogs metabolize much more slowly than humans. Dark chocolate edibles are especially dangerous because they contain higher concentrations.
Sugar-free edibles are potentially the most dangerous of all. Many contain xylitol (sometimes labeled as birch sugar or “sugar-free sweetener”), which triggers a massive insulin release in dogs. Blood sugar can crash within 10 to 60 minutes, causing weakness, staggering, collapse, and seizures. Untreated xylitol poisoning can be life-threatening on a timeline of hours, not days. In some cases, liver damage may not appear for 12 to 24 hours, which means a dog that initially seems fine may still need monitoring. If the edible was sugar-free, that’s a separate emergency on top of the THC.
What to Do Right Away
Call your vet or an animal poison control hotline immediately. Try to figure out how much THC was in the product, what other ingredients it contained, and roughly how long ago your dog ate it. This information helps the vet gauge severity.
One complication with THC ingestion is that it suppresses nausea. That’s useful for cancer patients but a problem when a vet wants to induce vomiting to clear the stomach. If your dog is already showing neurological symptoms like wobbliness or sedation, inducing vomiting at home is not safe because the risk of choking (aspiration) goes up significantly when coordination is impaired. If the ingestion just happened and your dog is still alert and acting normally, a vet may be able to induce vomiting before the THC takes effect.
Do not try to make your dog vomit at home without professional guidance. What works in other poisoning scenarios can backfire here.
What Veterinary Care Looks Like
Most treatment is supportive, meaning the vet keeps your dog safe and comfortable while the THC works its way out of their system. This typically involves IV fluids to maintain hydration and blood pressure, anti-nausea medication if needed, and monitoring of heart rate and temperature. In more severe cases, the vet may use a fat-based IV solution that helps bind THC (which is fat-soluble) and clear it from the bloodstream faster.
For mild cases where the dog is alert, walking steadily, and just seems a bit off, some vets will send you home with monitoring instructions. For moderate to severe cases, especially if the dog is very sedated, can’t walk, or also ingested chocolate or xylitol, expect an overnight hospital stay.
Recovery Timeline
Most dogs bounce back to normal within one to two days. Dogs that consumed large amounts or those that also ingested a co-toxicant like chocolate may take up to three days. During recovery, your dog may go through a period of being unusually quiet, sleeping more than normal, or having a reduced appetite. These are typical lingering effects, not signs of a new problem.
Keep your dog in a quiet, dimly lit space while they recover. Loud noises and bright lights can increase agitation in a THC-affected dog. Make sure water is easily accessible, because many dogs won’t seek it out on their own when sedated. If symptoms seem to be getting worse rather than gradually improving after 12 hours, or if your dog has seizures, can’t be roused, or shows signs of xylitol poisoning like sudden collapse, get back to the vet immediately.
Preventing It From Happening Again
Dogs are drawn to edibles because they smell and taste like treats. Gummies, brownies, cookies, and candy are all appealing to a dog’s nose. Store edibles in a locked container or a high shelf behind a closed door. Dogs can and will chew through plastic bags, purses, and backpacks to reach something that smells good. Recreational drugs remain in the ASPCA’s top 10 list of pet toxin exposures, accounting for about 2.1% of all cases reported to their poison control center in 2024.
If you have guests who use edibles, let them know where to store their products. A surprising number of veterinary THC cases come from dogs getting into a visitor’s bag or a product left on a low table. One precaution that takes five seconds can save you a panicked, expensive trip to the emergency vet.