Marijuana (Cannabis) Toxicity in Dogs
As marijuana becomes legal in more US states, dog exposures are increasing rapidly. Dogs are far more sensitive to THC than humans, and cannabis edibles are especially dangerous because they may also contain xylitol, chocolate, or raisins.
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⚡ Immediate Actions
- 1Call your vet — be honest about what your dog ate. Vets won't report you. They need accurate information to treat your dog.
- 2With edibles: check the ingredients — if they contain chocolate, raisins, or xylitol, this is a critical emergency
- 3Keep your dog calm, warm, and in a quiet space
- 4Do not leave them unattended — risk of vomiting while sedated
Symptoms & Timeline
Classic signs (30 min – 3 hours)
THC activates the dense population of CB1 cannabinoid receptors in the dog's cerebellum and brainstem, disrupting motor coordination and autonomic control. The involuntary urination reflects loss of bladder sphincter tone, while the paradoxically low heart rate results from vagal stimulation via central cannabinoid pathways.
- Ataxia — wobbly, uncoordinated walking
- Dilated pupils
- Slow heart rate (bradycardia)
- Dribbling urine involuntarily
- Drooling excessively
- Glassy, glazed expression
More severe
High-dose THC exposure, typical with edibles, causes profound CNS depression progressing toward stupor. Vomiting while the dog is heavily sedated creates a serious aspiration risk — stomach contents can be inhaled into the lungs, causing chemical pneumonia on top of the THC toxicity.
- Severe disorientation
- Vomiting while sedated (aspiration risk)
- Tremors or seizures (rare)
- Coma (rare — usually with edibles)
How Marijuana / Cannabis / THC Affects Dogs
Dogs have more cannabinoid receptors in their brains than humans, making them significantly more sensitive to THC. THC from secondhand smoke or ingestion affects the central and peripheral nervous system. Edibles pose greater risk because they're typically more concentrated and ingested faster.
What Your Vet Will Do at the Clinic
There is no specific antidote for THC toxicity, so treatment is entirely supportive. Activated charcoal is given if the dog is still conscious and ingestion was recent — this absorbs remaining THC in the gut before it enters systemic circulation. IV fluids maintain blood pressure and support the kidneys as they excrete THC metabolites. Anti-nausea drugs are important to prevent vomiting in a sedated dog, which could cause aspiration pneumonia. The dog is kept in a warm, quiet environment — THC can cause temperature dysregulation in either direction, and sensory stimulation worsens distress. Most dogs recover within 12–24 hours as the liver metabolizes THC, though edibles with concentrated doses may cause longer sedation.
Step-by-step protocol:
- 1Activated charcoal if ingestion was recent and dog is not heavily sedated
- 2IV fluids to support elimination and maintain blood pressure
- 3Anti-nausea medication to prevent aspiration of vomit
- 4Temperature regulation (THC can cause hypothermia or hyperthermia)
- 5Monitoring for respiratory depression and cardiovascular changes
- 6Observation until fully ambulatory — typically 12–24 hours
Frequently Asked Questions
Can a dog die from marijuana?
Deaths from marijuana alone in dogs are very rare. However, edibles containing xylitol, chocolate, or raisins can be fatal. The risk from marijuana itself is primarily disorientation, aspiration of vomit, and distress.
Can secondhand smoke hurt my dog?
Yes — dogs can be affected by secondhand cannabis smoke. Keep dogs out of rooms where marijuana is being smoked.
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