THC, the psychoactive compound in marijuana, is the most common substance that gets dogs high. Dogs are significantly more sensitive to THC than humans because they have a higher density of cannabinoid receptors in their brains. This means even a small amount of an edible, a discarded joint, or secondhand smoke can produce noticeable intoxication. Symptoms typically appear within 30 minutes to a few hours and can last up to 72 hours.
Why Dogs Are More Sensitive to THC
The brain’s cannabinoid receptors are what THC binds to in order to produce its effects. Dogs have more of these receptors packed into their brains than humans do. So a dose that would barely register for a person can hit a dog hard. This is why a single bite of a cannabis edible, or even nibbling on a discarded marijuana bud found on a walk, can send a dog into full-blown intoxication.
Dogs most commonly get exposed by eating edibles like brownies, gummies, cookies, or chocolate bars infused with cannabis. They can also eat raw marijuana flower, butter, or oil. Inhaling secondhand smoke is another route, though ingestion is far more common and typically produces stronger effects.
What a High Dog Looks Like
A dog experiencing THC intoxication doesn’t look like a relaxed, giggly human. The most frequently reported signs, based on a large survey of North American veterinarians, are urinary incontinence (leaking urine without realizing it), disorientation, loss of coordination, and lethargy. Many dogs also show heightened sensitivity to touch or sound, where normal contact seems to startle or bother them. A slower-than-normal heart rate is also common.
Some dogs become glassy-eyed or seem to stare into space. Others twitch, stumble, or appear mentally “checked out” to the point of being nearly unresponsive. The severity depends on the dog’s size, the amount consumed, and the THC concentration. A 10-pound dog eating half a potent edible will have a much worse experience than a large breed exposed to a small amount of smoke.
CBD Does Not Make Dogs High
If you’ve seen CBD products marketed for dogs and wondered whether those get them high, the answer is no. CBD is a different compound from THC and does not bind to the brain’s cannabinoid receptors in the same way. In a controlled study evaluating CBD oil in dogs, researchers found no behavioral differences between dogs given CBD and those that weren’t. CBD may have other effects being studied for anxiety and pain, but it does not produce intoxication.
The distinction matters because many cannabis products contain both THC and CBD. A “full spectrum” oil or edible designed for humans can absolutely contain enough THC to intoxicate a dog, even if CBD is the headline ingredient.
The Hidden Danger in Edibles
THC itself is rarely fatal to dogs. The vast majority recover completely without lasting effects. But edibles often contain ingredients that are independently toxic. Chocolate is one of the most common, since pot brownies and cannabis chocolate bars are popular products. Xylitol, an artificial sweetener found in some gummies and candies, can cause a rapid and dangerous drop in a dog’s blood sugar and potentially liver failure. Raisins, macadamia nuts, and high-fat content in baked goods can also cause separate, serious problems.
This is why a dog that ate a cannabis edible may need treatment not just for the THC, but for whatever else was in the product. A pot brownie, for example, requires attention for both cannabis and chocolate toxicity.
How Long It Lasts
After ingestion, effects usually start within 60 minutes and can persist for up to 72 hours in more serious cases. Most mild to moderate cases resolve on their own, and the prognosis is excellent. Dogs almost always make a full recovery.
During this window, affected dogs may be wobbly, drowsy, and disoriented. They may dribble urine, refuse food, or seem unable to stand properly. Keeping them in a quiet, safe space where they can’t fall off furniture or down stairs is the most practical thing you can do while the effects wear off.
Why Standard Drug Tests Don’t Work on Dogs
If you’re wondering whether a vet can simply run a drug test to confirm THC exposure, it’s not that straightforward. Dogs metabolize THC differently than humans. Over-the-counter urine drug tests designed for people look for a specific THC breakdown product called THC-COOH, and dogs don’t produce meaningful amounts of it. In one study, 20 out of 21 urine samples from dogs with confirmed marijuana exposure tested negative on a standard human drug screen. The dogs had plenty of THC in their systems, but their bodies processed it into different byproducts that the test couldn’t detect.
Veterinarians typically diagnose marijuana intoxication based on the combination of symptoms and the pet owner’s honesty about what the dog may have gotten into. Specialized lab testing using more sensitive equipment can confirm exposure, but it’s not routine.
Other Things That Can Look Like a High
Not every wobbly, disoriented dog has gotten into your stash. Several other conditions can mimic the appearance of intoxication. Ingesting other toxins like antifreeze, certain medications, or toxic plants can cause similar stumbling and confusion. Some dogs have inherited neurological conditions that cause progressive loss of coordination, trunk swaying, and an unsteady gait. A condition called exercise-induced collapse can make otherwise healthy young dogs suddenly become wobbly and lose control of their hind legs after intense activity.
If your dog is showing signs of disorientation or loss of coordination and you’re confident there was no access to marijuana, those symptoms still warrant veterinary attention. The overlap between THC intoxication and other serious conditions is significant enough that you shouldn’t assume the cause without more information.