How Long Does It Take for THC to Get Out of a Dog’s System? — 2026 Update

If a dog is exposed to THC, the effects can last much longer than in humans. While most dogs recover within 24–72 hours, THC can remain in their system for several days, depending on dose, size, and metabolism.

This guide explains timelines, symptoms, and what to expect.

Why THC Lasts Longer in Dogs

Dogs process THC differently from humans:

• Higher concentration of cannabinoid receptors in the brain
  
  
• Slower metabolism of THC compounds
  
  
• THC is stored in fat and released gradually
  

Because of this, even a small exposure can lead to prolonged effects.

How Long THC Effects Last in Dogs

Mild Exposure

• Effects: 6–12 hours
  
  
• Symptoms: lethargy, mild coordination issues
  

Moderate Exposure

• Effects: 12–24 hours
  
  
• Symptoms: vomiting, disorientation, drooling
  

Severe Exposure

• Effects: 24–72+ hours
  
  
• Symptoms: tremors, extreme lethargy, possible seizures
  

Note: Some dogs may appear “off” even after visible symptoms improve.

How Long THC Stays in a Dog’s System

Even after symptoms fade, THC may remain in the body:

• Detectable effects: up to 72 hours (or longer)
  
  
• Stored in fat tissue and slowly released
  
  
• Full elimination may take several days
  

Chronic or high-dose exposure can extend this timeline.

Factors That Affect Duration

Several variables influence how long THC stays in a dog’s system:

• Size and weight: Smaller dogs are more affected
  
  
• Amount consumed: Higher doses last longer
  
  
• Type of product: Edibles vs inhalation
  
  
• Metabolism and health: Older or sick dogs may recover more slowly

Symptoms Timeline to Watch

Within 1–2 Hours

• Lethargy
  
  
• Wobbly walking
  
  
• Dilated pupils
  

2–12 Hours

• Vomiting
  
  
• Drooling
  
  
• Confusion or anxiety
  

12–48 Hours

• Deep sleep or low responsiveness
  
  
• Continued coordination issues
  

48+ Hours (Severe Cases)

• Lingering weakness
  
  
• Rare complications requiring veterinary care

When to Call a Veterinarian

Contact a vet immediately if your dog shows:

• Seizures or tremors
  
  
• Trouble breathing
  
  
• Extreme lethargy or unresponsiveness
  
  
• Repeated vomiting
  

Puppies and small dogs should be evaluated sooner.

What Vets May Do

Veterinary treatment can include:

• IV fluids to support hydration
  
  
• Activated charcoal (if ingestion was recent)
  
  
• Anti-nausea medications
  
  
• Monitoring heart rate and temperature
  

Most dogs recover fully with proper care.

Can THC Be Fatal to Dogs?

• Death is rare but possible in extreme cases
  
  
• Risk increases with high doses or toxic ingredients (like xylitol in edibles)
  

Early intervention significantly reduces risk.

How to Prevent THC Exposure

• Store edibles and cannabis products securely
  
  
• Avoid leaving items within reach
  
  
• Never intentionally give THC to pets
  
  
• Be cautious with guests or shared spaces

FAQs: THC in Dogs

How long does THC stay in a dog’s system?

Most dogs recover within 24–72 hours, but THC may remain in the body for several days.

Can a dog recover without treatment?

Mild cases may resolve on their own, but veterinary guidance is strongly recommended.

How much THC is dangerous for dogs?

Even small amounts can cause symptoms, especially in smaller dogs.

Do THC edibles affect dogs more than smoke?

Yes. Edibles often contain higher THC doses and additional toxic ingredients.

Should I wait before calling a vet?

No. Contact a vet as soon as you suspect THC ingestion.

Final Takeaway

THC can stay in a dog’s system for several days, with effects lasting up to 72 hours or more, depending on exposure. While most dogs recover, symptoms can be serious—so quick action and veterinary guidance are key.