Cannabis (THC) Toxicity in Dogs

Cannabis (THC) Toxicity in Dogs

By
✔ MRCVS
BSc
BVM&S
FHEA
Reviewed by Dr. Jennifer Macindoe
✔ MRCVS
BVMS
Updated March 24, 2026
5 min read

Overview

Symptoms

Risk

Safe treats for dogs

Diagnosis

Vet treatment

Home treatment

Prevention

When to worry

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Cannabis (THC) Toxicity in Dogs

Cannabis (THC) Toxicity in Dogs

By
✔ MRCVS
BSc
BVM&S
FHEA
Reviewed by Dr. Jennifer Macindoe
✔ MRCVS
BVMS
Updated March 24, 2026
5 min read

Cannabis (THC) toxicity in dogs is becoming increasingly common in the UK as cannabis products become more accessible. Dogs are far more sensitive to THC than humans. Even small amounts can lead to symptoms, such as wobbliness, sedation, dilated pupils and changes in behaviour.  All dogs are vulnerable, but young and curious adult dogs are most at risk. Talk to a vet without delay if your dog has consumed a cannabis product.

Cannabis toxicity (marijuana poisoning, THC intoxication) happens when dogs ingest or inhale products containing tetrahydrocannabinol (THC), the psychoactive chemical found in the leaves and flowers of the cannabis plant. Edible cannabis products, such as gummies and cannabis ‘cakes’ are especially risky due to high concentration of THC and the presence of additional toxins, such as chocolate or xylitol (an artificial sweetener). With supportive care, most dogs will recover within 1–3 days, but severe cases and dogs who’ve consumed products containing additional toxins will usually need veterinary hospital treatment.

What is cannabis (THC) toxicity in dogs?

Symptoms of cannabis toxicity in dogs

Are some dogs more at risk of cannabis toxicity than others?

Safe treats for dogs

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How is cannabis toxicity diagnosed in dogs?

What’s the treatment for cannabis toxicity in dogs?

How to look after a dog with cannabis toxicity at home

Tips on how to prevent cannabis toxicity in dogs

When you should be worried about cannabis toxicity in dogs

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