The most common reason a dog suddenly looks “high” (wobbly, glassy-eyed, dazed, dribbling urine) is that it actually ingested something intoxicating, most often cannabis in some form. But several other causes, from moldy food to a neurological condition, can produce nearly identical behavior. Here’s how to tell what’s going on and what to do about it.
Cannabis Ingestion Is the Most Likely Cause
Dogs get into edibles, discarded joints, THC butter, and even cannabis flower more often than most owners expect. In a large survey of North American veterinarians, the most frequently reported signs of cannabis poisoning in dogs were urinary incontinence, disorientation, loss of coordination, lethargy, heightened sensitivity to touch or sound, and a noticeably slow heart rate. Many vets also reported dilated or glassy pupils and a “stupor” state where the dog seems conscious but mentally checked out.
Symptoms can start within 30 minutes of exposure or take several hours to appear, depending on what the dog ate and how much. They can last up to 72 hours, though most dogs start improving well before that. The good news: THC has a high margin of safety in dogs, with the minimum lethal dose sitting above 3 grams per kilogram of body weight, far more than a dog would get from a stray edible. The real danger comes from highly concentrated medical-grade THC products like cannabis butter, which have been linked to fatal cases.
One important detail: standard human urine drug tests do not reliably detect THC in dogs. If your vet needs to confirm cannabis exposure, those over-the-counter test strips won’t help. Be honest with your vet about what your dog may have accessed. They’re not going to judge you, and it helps them treat your dog faster.
The Telltale Sign: Urine Dribbling
If your dog is wobbling around and leaving a trail of urine without seeming to notice, cannabis exposure jumps to the top of the list. Urinary incontinence was the single most commonly reported sign in veterinary surveys of cannabis toxicity, even more frequent than the classic disorientation and stumbling. Dogs don’t consciously urinate; they simply leak. Combined with a dazed expression and wobbly legs, urine dribbling is about as close to a signature symptom as cannabis poisoning gets.
Vestibular Disease Looks Almost Identical
If your dog suddenly can’t walk straight, tilts its head to one side, and seems confused, it may not have eaten anything at all. Idiopathic vestibular syndrome, sometimes called “old dog vestibular disease,” affects the inner ear balance system and comes on without warning. It’s especially common in senior dogs.
The hallmark signs are a persistent head tilt toward one side, rapid involuntary eye movements (the eyes flick back and forth or up and down), loss of balance, and sometimes vomiting from what amounts to severe motion sickness. The key difference from intoxication: vestibular disease almost always involves a clear head tilt and those flickering eye movements. A dog that got into cannabis typically looks dazed and wobbly in all directions, without favoring one side. Check your dog’s eyes closely. If they’re darting rhythmically, vestibular disease is more likely than poisoning.
Vestibular syndrome usually improves on its own within a few days to two weeks, though some dogs keep a mild head tilt permanently. Your vet can confirm the diagnosis with a neurological exam.
Human Medications Are a Hidden Risk
Antidepressants, anti-anxiety medications, and sleep aids are among the most common human drugs accidentally ingested by dogs. A dog that swallows even one or two pills can develop signs that look a lot like being high: agitation or alternating with heavy sedation, tremors, wobbliness, and dilated pupils. In more serious cases, dogs develop serotonin syndrome, a dangerous overload of brain signaling that produces some combination of agitation, muscle twitching, rapid or irregular heartbeat, fever, and diarrhea.
The difference from cannabis ingestion is that these medications tend to produce more active, agitated behavior rather than the sleepy stupor of THC. A dog with serotonin syndrome may pace, vocalize, or startle easily. If you take any prescription medications and your dog had access to a pill bottle, counter, or purse, this is worth mentioning to your vet immediately.
Moldy Food and Compost Toxins
Dogs that raid trash cans, compost bins, or eat food that’s been sitting outside can ingest tremorgenic mycotoxins, toxic compounds produced by common molds. These cause muscle tremors, uncoordinated walking, and in severe cases, full seizures. The trembling and wobbliness can look like intoxication, but the tremors are usually more pronounced and rhythmic than the floppy lethargy of cannabis exposure.
In one documented case, four dogs in a single household were simultaneously affected after getting into the same source of moldy material. If your dog has been near garbage, compost, or old food and is trembling or twitching along with acting disoriented, mycotoxin exposure is a strong possibility.
Other Substances That Cause “High” Behavior
Several other household items can produce sudden neurological symptoms in dogs:
- Alcohol or fermenting fruit: Dogs that lap up spilled beer, cocktails, or eat rotting fruit can become visibly intoxicated with wobbliness, lethargy, and vomiting.
- Antifreeze (ethylene glycol): Initially causes a drunken, wobbly appearance. This one is a true emergency because it rapidly causes kidney failure.
- Prescription opioids: Produce heavy sedation, pinpoint pupils (the opposite of the dilated pupils seen with cannabis), and very slow breathing.
How to Respond Right Now
Start by doing a quick scan of your environment. Check for chewed packaging, open containers, spilled substances, accessible trash, or anything out of place. Look at your dog’s eyes: are the pupils very large and round (suggesting cannabis or stimulant exposure), darting side to side (suggesting vestibular disease), or tiny pinpoints (suggesting opioid exposure)? Note whether your dog is leaking urine, which strongly suggests cannabis. Check if there’s a head tilt, which points toward a vestibular problem.
If your dog is having seizures, is completely unresponsive, is trembling severely, or you suspect it ate something potentially lethal like antifreeze or a large quantity of medication, get to a veterinary emergency clinic right away. The same applies if symptoms are getting worse rather than stabilizing.
For suspected cannabis exposure in an otherwise stable dog (wobbly but conscious, no seizures, still responsive to your voice), the situation is uncomfortable for the dog but rarely life-threatening. Keep your dog in a quiet, dim room on a surface where it won’t fall. Offer water but don’t force it. Most dogs recover fully within 24 to 72 hours. A vet visit is still a good idea, especially for small dogs or if you’re not sure what or how much was ingested, because supportive care like IV fluids can speed recovery and prevent complications.