Marijuana & THC Toxicity in Dogs: Symptoms & Treatment
- See your vet immediately if your dog ate a THC edible, concentrate, vape liquid, or any cannabis product with chocolate, xylitol, raisins, or a large amount of butter or oil.
- Common signs are wobbling, marked sleepiness, dilated pupils, urine dribbling, vomiting, startling easily, and acting disoriented. Signs often start within 30 to 90 minutes, but edibles can take several hours to fully show effects.
- Most dogs recover with supportive care in 24 to 48 hours, though severe cases can take up to 72 hours. Recovery is usually good when your vet can monitor temperature, heart rate, breathing, and hydration.
- There is no home antidote for THC. Do not try to make your dog vomit unless your vet specifically tells you to, because sedated dogs can inhale vomit into the lungs.
How Dangerous Is Marijuana for Dogs?
Marijuana toxicity happens when a dog is exposed to THC, the main intoxicating compound in cannabis. Dogs are more sensitive to THC than people, so a dose that seems small to a human can cause obvious neurologic signs in a dog. The risk is higher now because cannabis products are more available and often come in forms dogs want to eat, especially brownies, gummies, cookies, and infused butter or oils.
The biggest concern is not always the cannabis alone. Many THC edibles also contain chocolate, xylitol, raisins, caffeine, or a large amount of fat. That can turn one poisoning into several at once. A dog that ate a chocolate THC brownie may need care for both THC intoxication and chocolate toxicity. A sugar-free edible can be even more urgent if it contains xylitol.
Most dogs recover fully with supportive care, but the signs can look dramatic. Affected dogs may seem drunk, weak, panicky, or very hard to wake up. If your dog may have gotten into cannabis, tell your vet exactly what product was involved, how much is missing, and when it happened. Your vet is there to treat your dog, not judge you.
Signs of Marijuana Toxicity in Dogs
- Wobbling, stumbling, or falling over (ataxia) — very common and often the first sign pet parents notice
- Extreme sleepiness, dullness, or stupor — concerning if your dog is hard to wake or cannot stay standing
- Dilated pupils — often paired with a glassy or unfocused look
- Urinary incontinence or urine dribbling — classic with THC intoxication
- Vomiting or drooling — may happen early, especially with edibles
- Hyperreactivity to sound, touch, or movement — some dogs startle easily or seem unusually anxious
- Slow heart rate — more common than a fast heart rate, and more concerning in small dogs or heavy exposures
- Low body temperature — dogs may feel cool and seem weak or limp
- Agitation, vocalizing, or confusion — some dogs are restless rather than sleepy
- Tremors or muscle twitching — can happen with higher doses or mixed toxicities
- Trouble swallowing or trouble breathing — emergency signs
- Seizures or collapse — uncommon, but an emergency when present
Signs often begin within 30 to 90 minutes after exposure, but edibles may take 1 to 4 hours to fully declare themselves because they must be digested first. Mild cases may look like a very sleepy, wobbly dog. More serious cases include inability to walk, repeated vomiting, marked slowing of the heart rate, low body temperature, trouble swallowing, or seizures. If your dog cannot be easily roused, cannot stand, or may have eaten an edible with chocolate or xylitol, see your vet immediately.
What Makes THC Toxic to Dogs?
THC affects receptors in the brain and nervous system that influence movement, awareness, temperature control, and behavior. Dogs appear more sensitive than humans to these effects, which is why they can become profoundly uncoordinated or sedated after exposures that do not seem large. THC is also fat-soluble, so it can linger in the body and signs may last a day or more.
Common exposure sources include dried flower, roaches, vape cartridges, tinctures, oils, concentrates, and especially edibles. Concentrates such as wax, shatter, and oils can contain far more THC than plant material. That means a small amount can cause a much bigger problem.
Edibles create extra risk because of their ingredients. Chocolate can cause vomiting, fast heart rate, tremors, and seizures. Xylitol can cause dangerous low blood sugar and liver injury. High-fat baked goods or infused butter may trigger pancreatitis in some dogs. Even secondhand smoke can cause mild signs in enclosed spaces, though ingestion is the usual cause of more significant toxicity.
How Is THC Toxicity Diagnosed?
Diagnosis is usually based on history, physical exam findings, and the pattern of signs. Your vet will ask what your dog got into, when it happened, how much may be missing, and whether the product contained chocolate, xylitol, raisins, caffeine, or other ingredients. That history matters because THC intoxication can look like other emergencies, including antifreeze poisoning, head trauma, neurologic disease, or overdose of other human medications.
On exam, your vet may find wobbliness, dilated pupils, urine dribbling, low body temperature, or a slow heart rate. Blood work may be recommended to check blood sugar, organ function, hydration, and to look for clues pointing to other toxicities. Human urine drug tests are sometimes used, but they are not reliable enough to rule THC exposure in or out by themselves.
If your dog is already showing neurologic signs, your vet may avoid inducing vomiting because sedated dogs are at higher risk of aspirating. In many cases, a careful history plus the exam gives your vet enough information to start treatment quickly.
Treatment Options for THC Toxicity
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Home Monitoring After Veterinary Guidance
- Phone triage with your vet or a pet poison service
- Review of the product type, likely dose, and added ingredients
- Home confinement in a quiet, padded, low-light area away from stairs and furniture
- Frequent checks that your dog can be awakened, swallow normally, and stay hydrated
- Short leash trips outside only if your dog can walk safely
- Clear return precautions if signs worsen
Outpatient or Short-Stay Supportive Care
- Physical exam and neurologic assessment
- Blood glucose and baseline blood work as needed
- Induced vomiting only if exposure was recent and your dog is still neurologically normal
- Activated charcoal in selected cases
- IV or subcutaneous fluids for hydration and support
- Anti-nausea medication if vomiting is present
- Temperature, heart rate, and blood pressure monitoring
- Observation for several hours until your dog is safe to go home
Hospitalization and Intensive Monitoring
- Continuous monitoring of heart rate, breathing, temperature, and neurologic status
- IV fluids and active warming support if body temperature is low
- Intravenous lipid emulsion in selected severe cases
- Oxygen support or airway protection if breathing or swallowing is impaired
- Medications for tremors, agitation, or seizures when needed
- Treatment for concurrent chocolate, xylitol, pancreatitis, or other co-toxins
- Overnight to 72-hour hospitalization depending on severity
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About THC Toxicity
Bring these questions to your vet appointment to get the most out of your visit.
- Based on my dog's size and the product involved, how worried should we be about this exposure?
- Does this product contain chocolate, xylitol, raisins, caffeine, or a lot of fat that changes the treatment plan?
- Is my dog a candidate for vomiting or activated charcoal, or is that unsafe now?
- What signs would mean my dog needs hospitalization instead of home monitoring?
- How long do you expect the wobbliness or sleepiness to last in this case?
- What should I watch for overnight, especially related to breathing, swallowing, temperature, or urination?
- Would blood work help rule out other toxins or complications in my dog's situation?
- If my dog goes home today, when should I call back or come in again?
Preventing Marijuana Toxicity in Dogs
Store all cannabis products the way you would store prescription medications: sealed, labeled, and out of reach. Locked cabinets are best. Edibles are especially risky because dogs are drawn to the smell and may eat the wrapper too. Keep purses, backpacks, and overnight bags picked up, since many accidental exposures happen when a visiting friend leaves gummies or vape cartridges within reach.
At home, avoid smoking or vaping around your dog. Inhaled exposure is usually less serious than eating a product, but it can still cause signs, especially in small dogs or poorly ventilated spaces. On walks, watch for discarded joints, roaches, or edible packaging in parks, sidewalks, and campsites.
If exposure happens, save the package and bring it with you or photograph the label for your vet. Do not give home remedies and do not induce vomiting unless your vet specifically instructs you to. Fast, honest information helps your vet choose the safest option for your dog.