How long do symptoms usually last after a pet is exposed to cannabis?

Mild signs typically improve within 24 hours, though more severe cases can persist for several days. If symptoms last beyond 48 hours or are getting worse, consult your vet for a reassessment.

Which cannabis-related household products can be toxic to pets?

THC-containing products such as smoked cannabis, edibles (e.g. baked goods, gummies), oils, and concentrates can all cause toxicity. If you suspect exposure, bring the product or its packaging so your vet can review it.

Can CBD products also cause toxicity in pets?

Pure CBD and THC-containing products carry different risk profiles, and product labelling can be inconsistent. If you suspect your pet has ingested any similar product, consult your vet and bring the product information with you.

What should I do if I think my pet has eaten cannabis?

Note the time and estimated amount ingested, observe for symptoms, and take photos or video. If your pet shows serious signs, contact your vet or a veterinary poison control centre immediately.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Cannabis Toxicity in Pets: Symptoms, Diagnosis & Supportive Care [2025]

Cannabis toxicity in pets most often occurs after accidental ingestion of THC-containing products. Signs include ataxia, lethargy, and urinary incontinence; most cases recover fully with supportive care.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: APCC, PPH, AVMA, WSAVA

When to See a Vet

Seek immediate emergency care

•Frequent or continuous seizures with loss of consciousness
•Coma or extremely poor response to stimulation
•Rapid breathing or gums turning purple or pale

Schedule a clinic visit soon (within 24–72 hours)

•Lethargy, prolonged drowsiness, and slow response
•Repeated vomiting or excessive drooling with signs of dehydration
•Stumbling, noticeably unsteady gait, and limited mobility

01What signs indicate something is wrong?

After exposure to cannabis (THC-containing) products, dogs and cats commonly display a range of behavioural and physical changes, from mild sedation to significant central nervous system depression.

Altered mental status: appearing depressed or unusually slow to respond
Repeated vomiting or regurgitation of food and fluid
Heart rate changes — may be elevated or reduced
Seizures or involuntary muscle tremors
Stumbling, incoordination, or loss of balance (ataxia)
Reduced appetite and noticeably lower activity level

Seek emergency care immediately if you notice the following symptoms:

⚠️ Repeated or continuous seizures with failure to regain consciousness
⚠️ Coma or extremely poor response to stimulation
⚠️ Rapid or laboured breathing, or gums that are purple or pale

02How can I assess the situation at home? Key observations and criteria for seeking emergency care

Keeping a record of these changes at home helps your vet assess the situation quickly and choose the most appropriate treatment.

Note the time symptoms began and the first abnormal behaviour you noticed
Record how many times your pet vomited, along with the colour and any identifiable contents
Monitor and track changes in appetite and water intake
Film any gait abnormalities, unusual reactions, or seizure episodes on your phone
Note any changes in urination or defecation frequency and consistency
If symptoms persist or worsen, arrange a vet visit or emergency consultation promptly

03How will the vet diagnose this? Common diagnostic steps

At the clinic, your vet will begin with a thorough physical examination and supplement this with laboratory and imaging tests to exclude other conditions or concurrent causes.

Physical examination

assessment of mentation, body temperature, heart rate, and respiratory rate

Blood and biochemistry panel

to rule out metabolic disturbances or organ dysfunction

Urinalysis

to evaluate kidney and metabolic impact

Radiography, CT, or MRI as needed to exclude other neurological or internal causes

Cardiac and respiratory monitoring, with supportive measures as indicated

04What is the treatment and home care plan? Medications, diet, and recovery guidance

Treatment centres on supportive care tailored to the presenting symptoms, with scheduled rechecks to monitor neurological recovery and organ function.

Acute phase: supportive care is the mainstay — controlling nausea and maintaining fluid and electrolyte balance
Your vet will advise on any medications and precautions relevant to your pet's condition
Short-term dietary management with bland, easily digestible food
Monitor mentation, elimination habits, and appetite after discharge
Schedule follow-up visits and any recommended blood or imaging re-checks as directed
If signs recur or worsen, seek further evaluation at a specialist centre

05What should I prepare before the vet visit? Key information to help the vet identify the cause quickly

Note when symptoms started, how they progressed, and any sudden changes

List recent foods, treats, and any substances your pet may have come into contact with

If safe to do so, bring a sample of any vomited material for testing

Bring a list of current medications, supplements, and vaccination records

Take photos or short videos to assist in on-site or remote assessment

If the situation is serious, call ahead to consult with the clinic or book an emergency appointment

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.