What Happens If a Dog Eats Weed?
If a dog eats weed containing THC, the effects can range from sleepiness and poor coordination to more serious neurological or cardiovascular problems. The safest response is to contact a vet or animal poison service rather than waiting to see how strongly your dog reacts.
Dogs can be particularly sensitive to THC. Common signs include lethargy, unsteady movement, vomiting, trembling and loss of bladder control. More severe effects are uncommon, but breathing problems, seizures and other complications can occur.
The exact risk depends on what was eaten, how concentrated it was, how much may have been consumed and whether the product contained anything else that is harmful to dogs.
What to Do If Your Dog Eats Weed
Your first priority is to stop any further access and gather enough information for a professional to assess what happened.
In the UK, you can contact your usual vet, an emergency veterinary practice or Animal PoisonLine on 01202 509 000. Animal PoisonLine operates 24 hours a day and is specifically intended for owners concerned that a pet may have been exposed to something poisonous.
Remove Any Remaining Cannabis
Move your dog away from the source and collect anything still within reach.
That may include:
- loose cannabis;
- joints or spliffs;
- edibles;
- oils or concentrates;
- packaging;
- discarded material.
If another pet could access the same area, remove them as well.
Keep the packaging if possible. The label may show THC concentration, serving size and other ingredients that are relevant to the veterinary assessment.
Check What Your Dog May Have Eaten
Try to work out:
- what product was involved;
- approximately how much is missing;
- when your dog may have eaten it;
- the labelled THC content, if known;
- whether other ingredients were present;
- what changes you have noticed in your dog.
Do not delay asking for help because some of those details are uncertain.
Being clear with the vet about possible cannabis exposure is useful. UK veterinary guidance specifically recommends telling the vet what happened so they can choose the appropriate treatment rather than having to work from incomplete information.
Contact a Vet or Animal Poison Service
If your dog is showing collapse, convulsions or breathing difficulties, contact a veterinarian immediately.
For other suspected exposures, a vet or Animal PoisonLine can advise whether the dog needs examination and treatment.
Do not try to make your dog vomit at home unless a veterinary professional specifically instructs you to do so. Animal PoisonLine advises owners not to induce vomiting themselves, partly because some poisons or neurological effects can make vomiting more dangerous.
What Happens After a Dog Eats Weed?
THC affects cannabinoid receptors in the nervous system. Dogs have a high concentration of these receptors in areas involved in movement and other important functions, which helps explain why loss of coordination is such a recognisable feature of THC poisoning in dogs.
The response is not identical in every animal. One dog may become very sleepy and wobbly, while another may show agitation, trembling or more pronounced changes.
Common Signs of THC Exposure
Signs can include:
- unusual drowsiness or lethargy;
- stumbling or poor coordination;
- vomiting;
- trembling or tremors;
- urinary incontinence;
- dilated pupils;
- sensitivity to movement, light or sound;
- agitation or twitching;
- changes in heart rate;
- changes in body temperature.
Vets Now also identifies disorientation and uncontrolled urination among signs seen in dogs after marijuana exposure.
These symptoms are not unique to cannabis. If there is a realistic chance your dog accessed weed, mention that possibility when speaking to the vet.
When the Effects May Be More Serious
Severe THC poisoning is less common, but respiratory depression, low blood pressure and seizures have been reported.
An edible or concentrate may also create a different level of exposure from ordinary cannabis plant material because THC concentrations vary considerably between products.
Do not use the physical size of the item alone to judge whether the exposure is minor.
How Long Does Weed Stay in a Dog’s System?
There is an important distinction between how long a dog appears affected and how long THC remains in the body.
After oral THC exposure, clinical signs commonly begin within around one to two hours. In substantially affected dogs, signs can persist for one to three days.
THC itself is distributed into body tissues and released relatively slowly. Merck reports a biological half-life of about 30 hours in dogs, with most THC excretion occurring over several days. That does not mean a dog will look intoxicated for that entire period.
The practical question is therefore not simply whether THC might still be present in the body. What matters is how your dog is behaving, what exposure occurred and whether veterinary monitoring is still needed.
How Long Does a Weed High Last for Dogs?
Visible effects can last much longer than owners expect.
Some dogs improve within a shorter period, while more substantially affected dogs may continue showing signs for one to three days. Current veterinary guidance describes the prognosis as generally good with appropriate supportive care.
Do not treat that timeframe as a reason to wait out an unknown exposure at home. A dog that remains markedly sleepy, unstable, difficult to rouse or otherwise abnormal still needs appropriate veterinary advice.
Can Dogs Eat Weed?
No. THC-containing cannabis should not be intentionally given to dogs.
Dogs can develop clinical signs at relatively low THC exposures, and product strength varies widely. Concentrates can contain much higher THC levels than ordinary cannabis plant material, while edibles may introduce other toxic ingredients at the same time.
A dog showing no immediate reaction does not prove that the exposure was safe. Signs after ingestion may take time to appear.
Can Dogs Get High From Weed Smoke?
Yes. Dogs can be affected by inhaled marijuana smoke.
Vets Now notes that dogs may be affected by second-hand cannabis smoke, while veterinary toxicology guidance shows that inhaled THC is absorbed rapidly and can produce signs within minutes.
This means deliberately exposing a dog to cannabis smoke is not a harmless way of including them in the environment.
Move a dog away from a smoke-filled area and provide fresh air. If unusual sleepiness, poor coordination, trembling or other concerning signs appear, contact a vet or animal poison service.
Can Dogs Be Affected by Secondhand Weed Smoke?
Second-hand exposure is possible, particularly where smoke is concentrated in an enclosed space.
The sensible prevention measure is straightforward: do not smoke cannabis around your dog, especially indoors or anywhere they cannot move away from the exposure.
Can a Dog Die From Eating Weed?
Death from THC poisoning in dogs is considered extremely rare, but severe poisoning can occur.
Merck notes that published canine fatalities have been reported, although the precise cause of death was not established in those cases and the dogs had consumed baked products made with concentrated marijuana butter.
That distinction matters. The low mortality rate should not be interpreted as evidence that any amount of cannabis is safe.
An unknown concentrate, an edible containing several potentially toxic ingredients and a small amount of plant material are not equivalent exposures. Veterinary assessment should be based on what actually happened rather than the statistical rarity of death.
Why Cannabis Edibles Can Be More Complicated
When a dog eats a cannabis edible, THC may be only one part of the problem.
A brownie or chocolate product may also contain chocolate. Sugar-free sweets or baked products can contain xylitol. Other recipes may contain raisins or additional ingredients that require their own veterinary assessment.
Vets Now specifically notes that a dog eating a cannabis brownie may need assessment for both marijuana and chocolate toxicity.
Check the Other Ingredients
If the packaging is available, keep it and check the full ingredient list.
Useful information includes:
- THC amount or concentration;
- serving size;
- chocolate or cocoa;
- xylitol;
- grapes or raisins;
- any other active ingredients.
Do not assume that treating the cannabis exposure alone answers the whole poisoning question.
How to Keep Cannabis Away From Your Dog
Prevention works best when access is physically blocked rather than relying on a dog showing no interest.
Keep cannabis flower, joints, oils, concentrates and edibles in closed storage that your dog cannot reach. A countertop or high table may not be enough for a dog that climbs, jumps or pulls objects down.
Store Cannabis Securely
Think beyond permanent storage.
Accidental access can happen through:
- handbags left on the floor;
- backpacks;
- jacket pockets;
- bedside tables;
- open packets;
- discarded joints;
- accessible bins;
- visitors’ belongings.
When walking your dog, pay attention to items picked up from the ground as well. UK emergency vets note that cannabis exposure can occur outside the home when dogs scavenge discarded material.
Keep Edibles and Packaging Out of Reach
Food-based cannabis products deserve particular care because a dog may be attracted to the food rather than the cannabis.
Put edibles back into secure storage after use and dispose of wrappers or leftovers where pets cannot retrieve them.
If the cannabis theme is part of your sense of humour, keep that part safely in playtime. A joint toy for dogs can carry the novelty without giving your dog access to the real substance.
Real cannabis and THC products should still remain securely out of reach.
What to Remember If Your Dog Eats Weed
If you suspect your dog has eaten cannabis, remove the source, keep any useful packaging and contact a vet or animal poison service with as much information as you have.
Do not wait for a particular symptom before deciding the exposure matters, and do not try to make your dog vomit at home.
Most dogs with THC poisoning recover with appropriate supportive care, but the product, concentration, amount consumed and presence of other toxic ingredients can materially change the situation.