If your dog ate a THC edible gummy, it will likely experience noticeable intoxication symptoms, but the vast majority of dogs recover fully within 24 to 36 hours. THC is rarely fatal to dogs, even at high doses, but the experience can look alarming. The bigger concern may actually be other ingredients in the gummy, particularly a sugar substitute called xylitol, which can be life-threatening even in small amounts.
Why Dogs React So Strongly to THC
Dogs are far more sensitive to THC than humans. The reason is biological: dogs have a high concentration of cannabinoid receptors in areas of the brain that control coordination, heart rate, and basic body functions, including the cerebellum and brainstem. THC binds to these receptors with strong affinity, which is why even a single gummy meant for a human can produce dramatic effects in a dog. A 10 mg edible that gives a person a mild buzz can send a 20-pound dog into a stumbling, glassy-eyed state for a full day.
Symptoms and How Quickly They Appear
Signs of THC intoxication typically show up within 30 to 60 minutes of ingestion. Because gummies are digested rather than inhaled, onset can sometimes take a few hours depending on whether your dog has a full stomach. The most common symptoms include:
- Incoordination or wobbly walking
- Deep lethargy or sedation
- A dazed, disoriented, or “spaced out” expression
- Urinary dribbling or loss of bladder control
- Extreme sensitivity to sound or touch
- Dilated or glassy-looking pupils
- Drooling or vomiting
In more serious cases, dogs may show agitation, unusual vocalizations, tremors, changes in heart rate, or difficulty regulating body temperature. Seizures and coma are possible in severe intoxication but uncommon.
These effects generally last 18 to 24 hours in dogs, which is longer than the roughly 12 hours humans experience. Full recovery usually happens within 24 to 36 hours, though some dogs take up to 72 hours to return completely to normal.
The Xylitol Risk May Be More Dangerous Than the THC
Many sugar-free gummies, including some THC edibles, contain xylitol as a sweetener. For dogs, xylitol is far more dangerous than THC. A dose as low as 0.1 grams per kilogram of body weight can trigger a dangerous drop in blood sugar (hypoglycemia), and doses above 0.5 grams per kilogram can cause acute liver failure. For a 20-pound dog, that’s less than a gram to reach the danger zone.
Xylitol poisoning progresses quickly and can become life-threatening within 30 minutes. If the gummy your dog ate contains xylitol, treat it as an emergency regardless of the THC content.
Not all sugar alcohols are equally dangerous. Erythritol, another common sweetener in gummies, is well-tolerated by dogs at doses far higher than what a single gummy would contain. The key is knowing which sweetener was used. Check the ingredient label if you still have the package.
What to Do Right Away
Call your veterinarian or an animal poison control hotline as soon as you realize what happened. Be honest about what your dog ate and how much. Veterinarians see THC cases regularly and will not judge you. Knowing the exact substance helps them treat your dog faster.
Do not try to induce vomiting at home unless a veterinarian specifically tells you to. THC has anti-nausea effects that can make vomiting difficult to trigger, and if your dog is already disoriented or sedated, vomiting creates a choking risk. A vet can safely manage decontamination if the ingestion was recent enough.
Keep your dog in a quiet, dimly lit space while you wait. Because THC makes dogs hypersensitive to sound and touch, a calm environment reduces their distress. Make sure they can’t fall off furniture or down stairs, since their coordination will be impaired.
What Happens at the Vet
Most THC cases are treated on an outpatient basis with supportive care. Your vet will focus on keeping your dog comfortable, hydrated, and stable while the drug works through their system. If your dog is severely affected, with very low heart rate, seizures, or unresponsiveness, they may need to stay for monitoring.
One important note: standard human urine drug tests do not reliably detect THC in dogs. Research has shown these tests frequently miss marijuana exposure in canine urine. Your vet will rely primarily on symptoms and your account of what happened, so the more detail you can provide, the better.
Recovery and Long-Term Effects
The prognosis for THC intoxication in dogs is overwhelmingly good. A large survey of veterinarians across North America found that nearly all animals fully recovered, with most cases involving only mild to moderate symptoms. One study found that oral THC doses of 3,000 to 9,000 mg per kilogram were not lethal in dogs, a dose astronomically higher than what any edible gummy contains.
Death from THC alone is extremely rare. The few published fatalities involved dogs that ingested edibles, and complications from other ingredients or pre-existing conditions may have played a role. Dogs that receive appropriate supportive care are not expected to have any permanent effects.
That said, the size of your dog matters. A Labrador that eats one 10 mg gummy will have a very different experience than a Chihuahua that eats five. Small dogs, puppies, and dogs with existing heart or liver conditions are at higher risk for more severe reactions. The combination of THC with chocolate (common in some edibles) or xylitol compounds the danger significantly.