When a dog eats a THC edible, it causes a toxic reaction that typically looks like extreme sedation, loss of coordination, and sometimes urinary incontinence. The good news: fatalities are extremely rare, and most dogs recover fully within one to two days. The bad news: your dog can feel noticeably ill, and the edible itself may contain ingredients like xylitol or chocolate that pose their own serious risks.
Symptoms and How Quickly They Appear
Signs can start within 30 minutes of ingestion, though in some cases it takes several hours. Dogs are far more sensitive to THC than humans. Mild symptoms can appear at doses as low as 0.3 to 0.5 mg of THC per kilogram of body weight, which means a small dog eating even a portion of a standard edible can be visibly affected. For context, a 20-pound dog weighs about 9 kg, so less than 5 mg of THC could produce noticeable signs.
What you’ll typically see:
- Loss of coordination. Your dog may stumble, sway, or seem unable to walk in a straight line.
- Extreme lethargy. They may seem “out of it,” unresponsive to their name, or unable to stay awake.
- Urinary incontinence. Dribbling urine without seeming to notice is common.
- Dilated pupils and a glazed expression.
- Exaggerated startle response. Some dogs flinch or jerk at sounds or touch.
- Vomiting or drooling.
At moderate to high doses (above 2 to 3 mg/kg), symptoms become more pronounced. Dogs may have trouble standing at all, show significant changes in heart rate, or in rare cases experience tremors or seizures. Symptoms can persist for up to 72 hours in severe exposures, though three days is unusual. Most dogs are back to normal within 24 to 48 hours.
Why Dogs React So Strongly
Dogs have a high concentration of cannabinoid receptors in their brain and nervous system. These receptors are involved in motor control, emotion, hunger, pain perception, and cardiovascular function. When THC floods these receptors, it essentially overwhelms the systems that control coordination, alertness, and basic body functions. This is why a dose that would barely register for a human can leave a dog barely able to walk.
Dogs also metabolize THC differently. Their bodies break it down into different compounds than human metabolism produces, and the effects tend to last longer. A human edible high might peak in a few hours, but a dog can be symptomatic for a full day or more.
The Edible Itself May Be the Bigger Danger
THC gets the attention, but the other ingredients in an edible can actually pose a more immediate threat to your dog’s life.
Xylitol is a sugar substitute found in many gummies, chocolates, and baked goods marketed as sugar-free. In dogs, xylitol triggers a massive release of insulin that can crash blood sugar levels within 10 to 60 minutes. Symptoms include vomiting, weakness, staggering, collapse, and seizures. In some cases, serious effects like liver damage don’t appear for 12 to 24 hours, which means a dog that seems fine initially may still need monitoring. Xylitol poisoning can be fatal without treatment.
Chocolate is toxic to dogs on its own, and chocolate edibles deliver a double hit. Dark chocolate and baking chocolate are the most dangerous. A THC brownie made with dark chocolate can cause both THC toxicity and chocolate poisoning simultaneously.
High fat content in butter-heavy edibles like cookies or brownies can trigger pancreatitis, a painful inflammation of the pancreas that may require hospitalization.
What to Do Right Now
Call your veterinarian or an emergency vet clinic immediately. If you can’t reach one, the ASPCA Poison Control Hotline (888-426-4435) and Pet Poison Helpline (855-764-7661) are available 24/7. Have this information ready: what the edible was, the brand or ingredient list if possible, roughly how much your dog ate, when they ate it, and your dog’s approximate weight.
Do not try to make your dog vomit without professional guidance. Inducing vomiting is sometimes the right call, but it can also be dangerous depending on what was ingested, how much time has passed, and your dog’s current state. A vet can tell you whether it’s safe in your specific situation.
Be honest with the vet about what your dog ate. Veterinary staff are not law enforcement, and they need accurate information to treat your pet correctly. THC toxicity and chocolate poisoning require very different interventions, and knowing the full picture can change the treatment plan entirely.
What Happens at the Vet
There is no antidote for THC in dogs. Treatment is supportive, meaning the vet manages symptoms and keeps your dog safe while the drug works its way out of their system. This may include IV fluids to prevent dehydration, medication to control nausea or tremors, and temperature regulation since THC can affect a dog’s ability to maintain normal body heat.
If the ingestion was recent, the vet may induce vomiting or administer activated charcoal to reduce how much THC gets absorbed. For dogs showing severe symptoms, hospitalization for monitoring is standard, especially if xylitol or chocolate was also involved.
One important limitation: standard urine drug tests designed for humans are unreliable in dogs. Dogs metabolize THC into different compounds than humans do, and those compounds appear in much lower concentrations in canine urine. A study evaluating a common human drug screening kit found zero positive results across 25 tests on dogs with suspected THC exposure. This is why your honest account of what happened matters more than any test the vet can run.
How Serious Is THC Toxicity in Dogs?
For THC alone, the risk of death is extremely low. The minimum lethal oral dose is estimated at more than 3 grams of THC per kilogram of body weight, which is roughly 1,000 times the dose that causes behavioral effects. No published lethal dose data exist in the scientific literature, and fatal outcomes are exceptionally rare. The cases where dogs have died typically involved very large amounts of highly concentrated products, or edibles containing other toxic ingredients like xylitol.
That said, “not lethal” doesn’t mean “not serious.” A dog with significant THC exposure can aspirate vomit if they’re too sedated to swallow properly, become dangerously dehydrated if they can’t drink water, or injure themselves falling off furniture or down stairs while uncoordinated. Small dogs and puppies are at higher risk simply because the same edible represents a much larger dose relative to their body weight.
The vast majority of dogs that receive appropriate veterinary care recover completely with no lasting effects. The experience is deeply unpleasant for them, but it is survivable, and keeping your dog safe and comfortable during the 24 to 48 hour window is the main goal.