Is Marijuana (THC) Toxic to Dogs?
Marijuana (cannabis) toxicity in dogs has increased dramatically with legalization. Dogs are much more sensitive to THC than humans and can be poisoned by eating plant material, edibles, concentrates, or inhaling secondhand smoke.
What Makes Marijuana / THC Dangerous to Dogs?
Marijuana (cannabis) toxicity in dogs has increased dramatically with legalization. Dogs are much more sensitive to THC than humans and can be poisoned by eating plant material, edibles, concentrates, or inhaling secondhand smoke. THC edibles are especially dangerous because they often contain chocolate or xylitol as well. While marijuana toxicity is rarely fatal in dogs, it can cause severe neurological symptoms and is frightening for both pets and owners.
Toxic Agent
Delta-9-tetrahydrocannabinol (THC)
Common Sources
- •Marijuana edibles (brownies, gummies, cookies)
- •Cannabis flower, buds, and joints (including discarded roaches)
- •THC concentrates, oils, and vape cartridges
- •THC butter and cooking oils
- •Secondhand smoke in enclosed spaces
Symptoms of Marijuana / THC Poisoning in Dogs
Mild Symptoms
- ▸Staggering and wobbly gait (ataxia)
- ▸Lethargy and drowsiness
- ▸Dilated pupils and glassy eyes
Moderate Symptoms
- ▸Urinary incontinence (dribbling urine)
- ▸Exaggerated startle response and agitation
- ▸Slow heart rate (bradycardia)
- ▸Hypothermia (low body temperature)
Severe / Emergency
- ▸Severe sedation or unresponsiveness
- ▸Seizures (especially with synthetic cannabinoids)
- ▸Aspiration pneumonia from vomiting while sedated
What to Do If Your Dog Is Exposed to Marijuana / THC
- 1
Keep your dog safe and in a calm, quiet environment.
- 2
Check if the product also contained chocolate, xylitol, or raisins (common in edibles).
- 3
Note the approximate amount and type of product (flower vs. edible vs. concentrate).
- 4
Use VetGeni's free toxin checker to assess the risk.
- 5
Contact your veterinarian — be honest about the substance. Vets are not law enforcement.
When to See the Vet
Seek veterinary care if your dog is lethargic, unresponsive, has a slow heart rate, or is vomiting while sedated (aspiration risk). Also seek immediate care if the edible contained chocolate or xylitol.
Prognosis
Excellent in most cases. Symptoms typically resolve within 12-24 hours with supportive care. Fatalities are very rare but can occur with synthetic cannabinoids or when edibles contain other toxins (chocolate, xylitol).
Check Marijuana / THC Toxicity for Your Pet
Enter your pet's weight and details for a personalized risk assessment. Free, no signup required.
Use the Free Toxin Checker ↓What you'll get
- Risk level and urgency in plain language
- Symptoms to watch for in coming hours
- Next steps your vet may recommend
- ASPCA Poison Control number for your call
Have this ready
- Substance name & estimated amount
- Pet weight and species
- Time since ingestion
- Current symptoms, if any
Frequently Asked Questions
- Can marijuana kill a dog?
- Death from marijuana alone is very rare in dogs, though it has been reported with highly concentrated products. The bigger danger is when edibles also contain chocolate or xylitol, or if a sedated dog vomits and aspirates. Regardless, veterinary care is recommended.
- Is CBD safe for dogs?
- CBD (cannabidiol) without THC is considered much less toxic than THC. Some CBD products are marketed for pets. However, CBD products may contain trace amounts of THC, and the market is largely unregulated. Consult your veterinarian before giving CBD to your pet.
- How long does marijuana toxicity last in dogs?
- Symptoms typically last 12-24 hours, though some dogs may appear lethargic or "off" for up to 72 hours. Edibles may take longer to resolve because THC is released more slowly through digestion.
Related Pet Toxins
Emergency? Call Poison Control
If your pet is showing severe symptoms, call immediately:
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Reviewed by Dr. Christopher Tiller, DVM — Emergency Veterinarian & VetGeni Founder. This information is for educational purposes and does not replace professional veterinary care. Always consult a veterinarian for specific medical advice.