Marijuana Toxicity in Dogs: Signs & What to Do
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Marijuana (THC) is toxic to dogs, and cases have risen sharply with legalization. Dogs are very sensitive to THC, and typical signs include wobbliness, a dazed or glassy look, dribbling urine, and being startled by sounds or touch. Most dogs recover with supportive care, but edibles — especially those containing chocolate or xylitol — can be far more serious. Be honest with your vet; it helps them treat quickly.
What to do if your dog ate marijuana
Tell your vet the truth about what your dog ate. It's confidential medical care, not a legal report, and it can save your dog's life.
- Call your vet, an emergency clinic, or a poison control line (ASPCA Animal Poison Control or Pet Poison Helpline).
- Say what form and how much — flower, edible, oil, or concentrate — and when. Edibles matter most, especially those with xylitol or chocolate.
- Don't induce vomiting unless a professional tells you to — a sedated dog can inhale vomit.
Vets aren't there to judge or report you. The faster they know THC is involved, the sooner they can rule out other causes and treat appropriately.
Why THC affects dogs so strongly
Dogs have a high number of cannabinoid receptors in their brains, which makes them more sensitive to THC than people. That's why an amount an adult might find mild can leave a dog heavily affected.
The most dangerous exposures are usually edibles, for three reasons: they can contain a lot of THC in a small bite, they often also contain chocolate or the sweetener xylitol (both separately toxic), and the fatty, sugary base is appealing to dogs. Concentrates and oils are also very potent. Secondhand smoke is a milder but real exposure route.
Symptoms of marijuana toxicity
Signs usually appear within 30 minutes to a few hours and can last a day or more:
- Wobbliness and incoordination (ataxia) — a classic staggering gait
- Dribbling urine (urinary incontinence) — a fairly distinctive sign
- A dazed, glassy-eyed or dull appearance
- Being easily startled by sounds, light or touch (hyperesthesia)
- Low body temperature, slow heart rate, and dilated pupils
- Drooling, vomiting, tremors; in severe cases seizures or loss of consciousness
Practical take: The combination of a wobbly dog that dribbles urine and startles at noise is so typical of THC that vets recognize it quickly — which is another reason honesty speeds things up.
How serious is it?
The good news is that marijuana toxicity is rarely fatal on its own, and most dogs recover fully with supportive care. The complications come from what THC arrives with and from severe cases:
| Scenario | Why it raises the risk |
|---|---|
| Plain THC, mild dose | Usually recovers with rest and monitoring. |
| Edible with chocolate | Adds theobromine/caffeine toxicity. |
| Edible with xylitol | Adds a potentially life-threatening blood-sugar and liver risk. |
| Very high dose / small dog | Risk of dangerously low temperature, breathing trouble, or inhaling vomit. |
Treatment and prevention
Treatment is supportive: keeping the dog warm, calm and hydrated, monitoring heart rate and temperature, and preventing injury while the effects wear off. If a large amount was recently eaten, your vet may decontaminate; in serious cases, IV fluids and closer care are used. If chocolate or xylitol is involved, those are treated too.
Prevention comes down to storage:
- Keep all cannabis products — especially edibles, oils and concentrates — sealed and well out of reach, treated like any medication.
- Be careful with guests' bags and pockets.
- Don't expose dogs to smoke.
Logging the exposure — form, amount and time — gives your vet a clear picture and helps track your dog's recovery.
Give your vet the full picture, fast
Tavi lets you log what your dog got into and when, track weight, and note symptoms as they appear — so your vet gets an accurate, judgment-free timeline to treat from. Free for your first pet.
Frequently asked questions
What are the signs a dog ate marijuana?
Common signs include wobbliness, a dazed or glassy-eyed look, dribbling urine, and being easily startled by sounds or touch, usually within 30 minutes to a few hours. You may also see drooling, low body temperature, a slow heart rate and dilated pupils. Severe cases can involve tremors or seizures.
Will marijuana kill a dog?
Marijuana toxicity is rarely fatal on its own, and most dogs recover fully with supportive care. The bigger dangers come from edibles that also contain chocolate or xylitol, from very high doses, and from complications like inhaling vomit, which is why prompt veterinary care matters.
Should I tell my vet my dog ate marijuana?
Yes, absolutely. Your vet is providing confidential medical care, not making a legal report, and knowing THC is involved lets them treat quickly and avoid unnecessary tests. Being honest about the form and amount can genuinely save your dog's life.
How long does marijuana toxicity last in dogs?
Effects usually begin within 30 minutes to a few hours and can last from around 12 hours up to a day or more, depending on the dose and form. Edibles tend to last longer than inhaled exposure. Your vet can guide you on monitoring during recovery.
Are cannabis edibles more dangerous than smoke for dogs?
Yes. Edibles are usually the most dangerous form because they can pack a large THC dose into a small bite and often contain chocolate or xylitol, which are separately toxic. Secondhand smoke causes milder exposure, but it's still best to keep dogs away from it entirely.
Tavi's guides are informational and not a substitute for professional veterinary advice, diagnosis or treatment. When in doubt, call your veterinarian. Sources: ASPCA Animal Poison Control Center; Pet Poison Helpline; Merck Veterinary Manual; VCA Animal Hospitals; American Veterinary Medical Association (AVMA)