What Happens If a Dog Eats Weed?
If your dog has eaten cannabis containing THC, contact your veterinarian or an animal poison service rather than waiting to see whether obvious symptoms develop. Dogs can become intoxicated after THC exposure, and the severity varies with the product, concentration, amount consumed and individual dog.
THC exposure can affect coordination, alertness, heart rate, body temperature and other functions. Many dogs recover well with appropriate supportive care, but cannabis should not be treated as harmless simply because serious outcomes are uncommon.
In Canada, cannabis may be more familiar and accessible than it once was, but legal availability does not make THC safe for pets. Health Canada specifically identifies pets as being at greater risk of accidental cannabis poisoning and recommends keeping cannabis locked away and out of their reach.
What to Do If Your Dog Eats Weed
Start by preventing any further exposure and gathering the information a veterinarian will need.
You do not need to know the exact dose before asking for help. Product labels, packaging and an estimate of what is missing can provide more useful information than trying to decide for yourself whether the amount was small enough to ignore.
Remove Any Remaining Cannabis
Take the product away and check the surrounding area for anything else your dog could reach.
That includes loose cannabis, joints, edibles, oils, concentrates and discarded packaging. If other pets are present, make sure they cannot access the same material.
Keep the package or container if you have it. The THC concentration and ingredient list may affect how the exposure is assessed.
Check What Your Dog May Have Eaten
Try to establish:
- what type of cannabis product was involved;
- how much may be missing;
- approximately when your dog gained access to it;
- the THC concentration, if it is labelled;
- whether other ingredients were present;
- whether your dog is already behaving differently.
An accurate exposure history matters. Veterinary toxicology guidance notes that knowing the substance, amount, timing and signs can help with diagnosis and treatment decisions.
Contact a Veterinarian or Pet Poison Service
Pet Poison Helpline provides a 24-hour animal poison-control service throughout Canada and can assist pet owners and veterinarians with potentially poisoned animals. Its current medical-assistance number is (855) 764-7661, and a consultation fee applies.
If your dog is already severely affected, having trouble breathing, collapsing, having a seizure or showing another serious change, seek veterinary care promptly rather than relying only on telephone advice.
Do not try to make your dog vomit unless a veterinarian or poison specialist specifically tells you to. Pet Poison Helpline advises against inducing vomiting or giving home antidotes without professional guidance.
Is Weed Bad for Dogs?
Yes. Cannabis containing psychoactive THC can poison dogs.
Pet Poison Helpline states that there is no safe dose of psychoactive marijuana for companion animals. Ingestion can produce gastrointestinal and neurological effects, while more severe poisoning can affect breathing or cause collapse or seizures.
THC interacts strongly with cannabinoid receptors in the nervous system. Dogs have receptor distribution that may help explain why poor coordination and cardiovascular or respiratory effects can be particularly noticeable in this species.
This does not mean every exposure leads to the same outcome. A dog that swallowed part of a low-concentration product and a dog that consumed concentrated THC have experienced different exposures. The product itself matters just as much as the word "weed."
Signs a Dog May Show After Eating Weed
THC intoxication can look different from one dog to another.
The most commonly reported signs include:
- unusual sleepiness or lethargy;
- difficulty walking or poor coordination;
- vomiting;
- urinary incontinence;
- trembling;
- increased sensitivity to movement or sound;
- dilated pupils;
- agitation or twitching;
- changes in heart rate;
- changes in body temperature.
Rarely, more serious effects such as respiratory depression, low blood pressure or seizures can occur.
Changes in Coordination and Alertness
A dog that suddenly looks unsteady, unusually quiet or difficult to rouse may be showing neurological effects of THC.
Poor coordination is particularly common. Affected dogs may sway, stumble or struggle to walk normally. Lethargy is also one of the most frequently reported signs of THC ingestion.
These signs are not unique to cannabis poisoning. If exposure is possible, tell the veterinarian what you know instead of relying on the dog's behaviour alone to identify the cause.
Signs That Need Prompt Veterinary Attention
Severe depression, collapse, breathing difficulty and seizures warrant urgent veterinary assessment.
The absence of dramatic symptoms does not necessarily mean no action is needed. THC concentration can vary substantially between cannabis flower, extracts, oils and concentrated products.
If the product was an edible, there may also be more than one toxic exposure involved.
How Long Can the Effects of Weed Last in Dogs?
THC intoxication in dogs can last much longer than a typical human perception of being "high."
After cannabis is eaten, signs commonly begin within about one to two hours, although onset may take longer in some circumstances. In substantially affected dogs, clinical signs can persist for one to three days.
Those figures describe typical veterinary observations, not a timetable for deciding when a dog no longer needs care.
THC is distributed into body tissues and eliminated relatively slowly. How long an individual dog remains affected depends on the exposure and severity of the intoxication.
If your dog remains markedly sleepy, unstable or otherwise abnormal, continue following veterinary advice rather than assuming enough time has passed.
Can Dogs Get High From Weed Smoke?
Yes. A dog can be exposed to psychoactive THC through marijuana smoke.
Pet Poison Helpline states that inhalation of psychoactive marijuana smoke can cause poisoning in pets. Merck also notes that inhaled THC is absorbed rapidly and can produce clinical effects within minutes.
That makes smoke exposure different from simply being in a home where cannabis is securely stored.
Do not intentionally expose a dog to marijuana smoke. If your dog has been in a heavily exposed environment and develops unusual sleepiness, poor coordination, trembling, urinary incontinence or other concerning signs, move them away from the source and contact a veterinarian or animal poison service.
There is no useful reason to judge whether a dog is merely "a little high." The relevant question is whether THC exposure has caused intoxication that requires assessment or monitoring.
Why Cannabis Edibles Can Be More Complicated
An edible may contain THC plus ingredients that create separate risks for dogs.
Chocolate, for example, can affect the cardiovascular and central nervous systems when enough is consumed. Xylitol, a sweetener used in some sugar-free foods and other products, can cause profound hypoglycemia in dogs and, at higher exposures, serious liver injury.
Other food hazards can also be present depending on the edible.
That means "my dog ate a cannabis brownie" is not the same exposure as "my dog ate cannabis flower." Both require attention, but the veterinarian may need to assess different hazards.
Check the Other Ingredients
Keep the original package if possible and read the full ingredient list.
Look for information about:
- total THC content;
- serving size;
- chocolate or cocoa;
- xylitol;
- grapes or raisins;
- other active ingredients.
Health Canada recommends keeping edible cannabis separate from normal food and storing cannabis in its original secure packaging. That helps prevent accidental access and also preserves useful product information if an exposure occurs.
Do not assume cannabis is the only concern simply because it is the ingredient that first caught your attention.
How to Prevent Cannabis Exposure at Home
The safest approach is to make cannabis genuinely inaccessible rather than relying on your dog not showing interest in it.
Health Canada recommends storing cannabis locked away, out of sight and out of reach of pets. Edible cannabis should also be kept separate from ordinary foods and drinks.
Use Secure Storage, Not Just a High Surface
Dogs can reach food and objects that owners assume are safely above them.
A closed, secured cupboard or lockable container is more reliable than:
- a kitchen counter;
- coffee table;
- bedside table;
- open shelf;
- handbag left on the floor;
- backpack;
- accessible rubbish bin.
Return cannabis to secure storage after use rather than leaving it unattended.
Pay Attention to Edibles and Packaging
Edibles may attract a dog because they resemble ordinary human food.
Keep the original child-resistant packaging where possible and dispose of leftovers or wrappers where pets cannot retrieve them. Health Canada specifically identifies accidental poisoning from edible cannabis as a risk to pets.
The joke can stay separate from the substance itself. If cannabis-themed humour is part of your household, a spliff dog toy can keep that idea in the toy box while actual cannabis stays secured where your dog cannot reach it.
That distinction matters. A novelty dog toy belongs in playtime. THC-containing cannabis does not.
What to Remember If Your Dog Gets Into Weed
If you suspect cannabis exposure, focus on the information that can help your veterinarian make a decision.
Remove access to the product, keep the packaging, identify what may have been consumed and contact a veterinarian or animal poison service. Do not wait for your dog to become severely affected and do not attempt unverified home remedies.
THC intoxication generally has a good prognosis with appropriate supportive care, and fatal outcomes are considered extremely rare. That favourable prognosis should not be mistaken for proof that an unknown exposure is safe to ignore.