If your dog is stumbling around, seems overly sensitive to touch or sound, looks dazed, or is dribbling urine, there’s a good chance it got into marijuana. THC affects dogs much more intensely than it affects people, and the signs can look alarming even when the outcome is usually fine. Here’s what’s happening in your dog’s body and how to tell if you need a vet.
Signs Your Dog Got Into Weed
The most telltale sign is a wobbly, uncoordinated walk. In a study of 223 confirmed marijuana toxicity cases in dogs, 88% showed this kind of stumbling gait. The second most common sign, appearing in 75% of cases, is an exaggerated startle response to touch or sound. Your dog might flinch hard when you pet it, jump at noises it normally ignores, or seem generally “on edge” even while looking half-asleep.
About 63% of affected dogs become noticeably lethargic, and nearly half dribble urine without seeming to notice. That combination of being unsteady on their feet, jumpy, sleepy, and leaking urine is one of the most recognizable patterns veterinarians associate with THC exposure. Other things you might see include:
- Tremors or twitching (about 33% of cases)
- Dilated or glassy-looking pupils (22%)
- Falling over or leaning to one side (22%)
- A dazed, “nobody’s home” expression (19%)
- Falling asleep during normal activity (12%)
- Head bobbing (11%)
- Vomiting (26%)
A typical case involves a younger dog that suddenly develops these signs after being outside, visiting a park, or being left unsupervised around a person’s stash. Symptoms can start within 30 minutes of exposure or take several hours to appear, depending on whether the dog inhaled secondhand smoke or ate an edible.
Why THC Hits Dogs So Much Harder
Dogs have the same type of cannabinoid receptors in their brains that humans do, but the distribution is very different. In humans, these receptors are sparse in the brain stem and the areas that control balance, breathing, and heart rate. In dogs, those exact regions are packed with them. The cerebellum, which coordinates movement, is especially dense with cannabinoid receptors in dogs. That’s why THC causes a specific condition in dogs called “static ataxia,” a distinctive swaying and stumbling that doesn’t really have a human equivalent.
Because THC binds directly to these receptors, and because dogs have so many of them in critical brain areas, even a small amount of marijuana can produce dramatic neurological effects. A dog that eats part of an edible or chews on a discarded joint is getting a dose that, relative to body weight and receptor density, vastly exceeds what a human would experience from the same product.
How Long It Lasts
Most dogs recover within 24 hours, but symptoms can persist for up to 72 hours in some cases. Edibles tend to cause longer-lasting effects than inhaled smoke because THC absorbed through the gut releases more slowly. During the worst of it, which typically peaks a few hours after ingestion, your dog may seem deeply sedated, unresponsive to commands, or unable to walk in a straight line. This gradually improves as the THC is metabolized.
The good news: the lethal dose of THC for dogs is extremely high, more than 3 grams per kilogram of body weight. For context, that would mean a 30-pound dog would need to consume an almost impossibly large quantity of pure THC. Fatalities from THC alone are essentially unheard of. The real danger usually comes from something else in the product.
The Hidden Danger in Edibles
Marijuana edibles are the most common source of dog exposure, and they often contain ingredients that are far more dangerous to dogs than the THC itself. Chocolate edibles combine two toxins at once. Sugar-free edibles and gummies may contain xylitol (sometimes labeled as birch sugar), an artificial sweetener that can cause life-threatening drops in blood sugar and liver failure in dogs even in small amounts. Butter-heavy edibles can trigger pancreatitis.
If your dog ate an edible rather than just getting a whiff of smoke, knowing exactly what was in it matters. The packaging or ingredient list can help your vet determine whether there’s a secondary toxin to worry about.
When Your Dog Needs a Vet
Many mild cases are managed with outpatient monitoring, meaning the vet confirms what happened and sends you home with instructions to watch your dog while the effects wear off. That said, certain signs push a case from “uncomfortable but manageable” to “needs medical attention now”: seizures, loss of consciousness, inability to stand at all, difficulty breathing, a very slow heart rate, or an inability to regulate body temperature (feeling unusually hot or cold to the touch).
If your dog ate an edible containing chocolate or xylitol, that’s an automatic vet visit regardless of how your dog looks. Xylitol toxicity can be fatal within hours and may not produce obvious symptoms until it’s already causing organ damage.
At the vet, treatment depends on timing and severity. If the ingestion was recent, the vet may induce vomiting or give activated charcoal to limit how much THC gets absorbed. For more severe cases, intravenous fluids and monitoring are the standard approach. In rare situations involving large doses, vets may use a fat-based IV solution that helps pull THC out of the bloodstream faster.
What to Do at Home
If your dog’s symptoms are mild (a little wobbly, a bit sleepy, but still responsive and breathing normally), keep the environment quiet and calm. Reduce stimulation: dim the lights, turn down the TV, and avoid handling your dog more than necessary. That heightened sensitivity to touch and sound is genuine discomfort, not just confusion. Make sure fresh water is available, and put down towels or puppy pads since urinary dribbling is common and your dog won’t be able to control it.
Don’t try to make your dog vomit at home unless specifically instructed by a veterinarian or poison control. If your dog is already uncoordinated or sedated, vomiting can lead to aspiration, where vomit enters the lungs. You can call the Pet Poison Helpline or the ASPCA Animal Poison Control Center for guidance specific to your dog’s size, what they got into, and how much.
Be honest with your vet if you go in. Veterinarians are not obligated to report drug use, and they’ve seen a 448% increase in marijuana cases in recent years. They won’t judge you. What they need is accurate information so they can treat your dog correctly instead of running unnecessary tests for other toxins or neurological conditions that mimic THC exposure.