My Dog Ate Weed: Warning Signs and What to Do Now
If your dog ate weed, every minute counts. Learn to recognize cannabis poisoning symptoms in dogs and when to rush to the vet.
As cannabis legalization spreads across the United States and other countries, veterinary emergency rooms are seeing a sharp rise in marijuana poisoning cases in dogs. The ASPCA Animal Poison Control Center has reported more than a fourfold increase in cannabis-related calls over the past decade. If your dog just got into your stash, ate an edible, or chewed on a cannabis plant, here is exactly what you need to know to act fast and keep your pet safe.
Why Is Cannabis So Dangerous for Dogs?
The primary psychoactive compound in marijuana is delta-9-tetrahydrocannabinol (THC). Dogs have a significantly higher density of cannabinoid receptors in the cerebellum and brainstem than humans, making them far more sensitive to THC's effects. A dose that barely affects an adult human can cause severe neurological symptoms in a dog, particularly in puppies or small breeds where even a tiny amount can be toxic relative to body weight.
Cannabis edibles pose a double threat. Many contain chocolate, xylitol, raisins, or other ingredients that are independently toxic to dogs. A marijuana brownie, for example, can simultaneously cause THC intoxication and chocolate toxicity, dramatically increasing the medical complexity of the situation.
Symptoms of Marijuana Poisoning in Dogs
Signs typically appear within 30 minutes to 3 hours after ingestion, though fatty edibles can slow absorption and delay the onset. The most common clinical signs include:
- Ataxia: the dog walks as if drunk, stumbling and losing balance frequently.
- Dilated pupils (mydriasis): eyes appear abnormally wide even in well-lit rooms.
- Urinary incontinence: the dog urinates uncontrollably, often without awareness.
- Extreme lethargy: difficulty staying awake or responding to stimuli.
- Hyperreactivity to sounds or movement: exaggerated startle responses.
- Vomiting: particularly in the first hours after ingestion.
- Abnormal heart rate: either unusually slow (bradycardia) or fast (tachycardia).
- Hypothermia: body temperature dropping below normal range.
In severe cases, though uncommon, seizures or coma can occur. Death directly from THC alone is rare, but when combined with xylitol or large amounts of chocolate, outcomes can be fatal without prompt treatment.
What to Do If Your Dog Ate Weed
Stay calm, but act quickly. Follow these steps:
- Estimate what and how much was consumed. Try to determine the type of product (dried flower, oil, edible, concentrate) and the approximate quantity. This information is critical for the vet.
- Call a veterinarian or poison control hotline immediately. In the US, the ASPCA Poison Control (888-426-4435) and Pet Poison Helpline (855-764-7661) operate 24/7 and can guide you on next steps.
- Do not induce vomiting without medical guidance. Unlike some other toxins, inducing vomiting in a dog already showing neurological signs can increase the risk of aspiration pneumonia, making things worse.
- Go to an emergency vet right away if your dog is seizing, unconscious, has very low body temperature, or if the ingested product contained chocolate, xylitol, or raisins.
Veterinary Treatment: What to Expect
There is no specific antidote for THC poisoning in dogs. Treatment is primarily supportive care. The veterinarian may administer intravenous fluids to maintain hydration and blood pressure, give activated charcoal (if ingestion was recent and the dog is fully conscious) to reduce further gastrointestinal absorption of the toxin, and closely monitor vital signs including temperature, heart rate, and blood pressure throughout recovery.
Most dogs recover fully within 12 to 24 hours, though cases involving large quantities or very small dogs may take up to 72 hours. Early veterinary intervention is the single most important factor in a smooth recovery. Be honest with your vet about what your dog consumed — they are not there to judge you, and withholding information can cost your dog its life.
Prevention: Keeping Your Dog Away From Cannabis
Prevention is always the best medicine. Store all cannabis products in airtight, child-proof containers in locations completely inaccessible to your dog — treat them exactly as you would prescription medications. Remember that dogs have an extraordinarily powerful sense of smell and can detect cannabis products even inside sealed bags tucked away in backpacks or drawers. If you grow cannabis plants at home, ensure your dog has zero access to them at any stage of growth. For dogs that are particularly curious or prone to counter-surfing and scavenging, consider adding cabinet locks to wherever these substances are stored.
Understanding the risks and knowing how to respond can make an enormous difference in your dog's outcome. The faster you act and the more transparent you are with your veterinarian, the better your pet's chances of a full and speedy recovery.
