When a dog gets high from marijuana, the experience is nothing like what humans feel. Dogs are far more sensitive to THC than people, and what looks like a mild dose to you can cause serious neurological symptoms in your pet. Most dogs recover within 24 to 72 hours, but the experience is distressing for the animal and can occasionally become dangerous, especially if the product contained other toxic ingredients.
Why Dogs React So Differently Than Humans
Dogs have a much higher density of cannabinoid receptors in their brains than humans do. This makes them dramatically more sensitive to THC. A dog can develop noticeable symptoms at doses as low as 0.3 to 0.5 milligrams of THC per kilogram of body weight. To put that in perspective, a single edible gummy meant for a person could contain enough THC to affect a medium-sized dog several times over.
Dogs also can’t understand what’s happening to them. A human who feels too high can rationalize the sensation and wait it out. A dog experiencing the same neurological effects has no context for why the room is spinning or why its legs won’t cooperate. This makes the experience inherently more stressful and potentially harmful for them.
What THC Intoxication Looks Like in Dogs
The most common and recognizable sign is a loss of coordination. Your dog may stumble, sway, or struggle to walk in a straight line. Many dogs become unusually lethargic, lying down and barely responding to stimuli. Others swing in the opposite direction and become agitated or hypersensitive to sound and touch. Dilated pupils, drooling, and a slow heart rate are also typical. One of the more distinctive signs is urinary incontinence: a house-trained dog suddenly urinating without seeming to notice.
Some dogs experience vomiting, which can actually be protective if the THC hasn’t been fully absorbed yet. In more significant exposures, you might see tremors, exaggerated startle responses, or a glassy, unfocused look in the eyes. In rare and severe cases, dogs can lose consciousness or develop seizures.
How Quickly Symptoms Start and How Long They Last
If a dog eats a cannabis product, symptoms typically appear within 30 minutes to a few hours, depending on how full the dog’s stomach was and what form the THC came in. Edibles with high fat content (like butter-based brownies) can delay the onset because they take longer to digest, but they also increase THC absorption, which can make the effects stronger once they hit.
Secondhand smoke exposure tends to produce milder and faster-onset symptoms. The effects from any route of exposure generally last 12 to 36 hours in mild cases. Moderate to severe cases can take longer, with some dogs showing lingering grogginess or unsteadiness for up to 72 hours. Dogs that received veterinary treatment involving intravenous fat-based solutions (which help pull THC out of tissues) sometimes still had recovery times of four to six days in more serious poisoning cases.
The Real Danger: What’s Mixed In
THC itself has a wide safety margin in dogs. The minimum lethal oral dose is estimated at over 3 grams per kilogram of body weight, roughly 1,000 times the dose that causes behavioral effects. So while THC alone is very unlikely to kill a dog, the products it comes in are another story entirely.
Edibles are the most common source of dog exposures, and they often contain ingredients that are genuinely dangerous to dogs. Chocolate edibles introduce theobromine toxicity on top of the THC. Sugar-free edibles may contain xylitol, an artificial sweetener that can cause life-threatening drops in blood sugar and liver failure in dogs. High-fat butter and oils used in homemade edibles can trigger pancreatitis, a painful and sometimes serious inflammatory condition. Cornell University’s veterinary school specifically flags these combination exposures as the highest-risk scenario.
If your dog got into an edible, try to find the packaging. Knowing whether the product contained chocolate, xylitol, or other additives is critical information for a veterinarian and changes how urgently the situation needs to be handled.
When a Dog Needs Veterinary Care
Mild cases where a dog is slightly wobbly but still alert, drinking water, and able to walk often resolve on their own with monitoring at home. Keep the dog in a quiet, dimly lit space and prevent it from climbing stairs or jumping onto furniture where a fall could cause injury.
Veterinary attention is warranted if your dog shows any of the following: inability to stand or walk, repeated vomiting, extreme lethargy where the dog is difficult to rouse, tremors, seizures, or a very slow heart rate. If the product contained chocolate or xylitol, the dog should be seen regardless of how it appears, because those toxicities can have delayed and severe consequences.
Be honest with the vet about what your dog consumed. Veterinary staff are not going to judge you or report you. They need accurate information because THC intoxication mimics other serious conditions, including antifreeze poisoning and certain neurological emergencies. Knowing it’s cannabis lets them skip unnecessary and expensive diagnostic testing and focus on supportive care.
How Vets Confirm and Treat THC Exposure
Diagnosis is usually based on symptoms and history, but vets can use human urine drug test strips on dog urine as a quick screening tool. These tests were designed to detect a specific THC byproduct that humans produce, and dogs actually metabolize THC differently, producing different breakdown compounds. However, the test strips still pick up positive results in exposed dogs through cross-reactivity with those canine-specific metabolites. A 2025 study in Frontiers in Veterinary Science found that a standard point-of-care test correctly identified all nine dogs with confirmed cannabis ingestion and returned negative results in all control animals.
Treatment is supportive rather than curative. There’s no antidote for THC in dogs. If the ingestion was recent (within the last couple of hours), the vet may induce vomiting to limit further absorption. Beyond that, treatment focuses on keeping the dog warm, hydrated, and safe. Dogs that are vomiting repeatedly may receive anti-nausea medication. In severe cases, vets may use intravenous fluids and, in some situations, lipid emulsion therapy, a fat-based IV solution that works by pulling THC (which dissolves readily in fat) out of the dog’s brain tissue and into the bloodstream where it can be processed and eliminated.
THC vs. CBD: Not the Same Risk
CBD products marketed for pets generally contain little to no THC and have a much more favorable safety profile in dogs. The intoxication symptoms described above are caused specifically by THC, the psychoactive compound in marijuana. Pure CBD does not produce the same neurological effects. That said, the CBD pet product market is poorly regulated, and some products contain more THC than their labels claim. If your dog shows signs of intoxication after consuming a CBD product, treat it exactly as you would a THC exposure.
The rising availability of high-potency THC products, including concentrates and edibles with 50 to 100 milligrams of THC per serving, has made accidental dog exposures more common and more severe than they were a decade ago. Storing cannabis products in sealed, dog-proof containers is the simplest way to prevent an episode that’s frightening for your pet and potentially expensive to treat.