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Is Marijuana Toxic to Dogs? Signs and What to Do

PawAI Lab
7 min read

Learn whether marijuana and cannabis products pose a toxicity risk to dogs, why dogs may be more sensitive to THC than humans, and what steps a veterinarian may recommend after exposure.

Quick Answer

Yes, marijuana (cannabis) is toxic to dogs. The primary active compound, THC (delta-9-tetrahydrocannabinol), can affect a dog's nervous system, and dogs are reported to be more sensitive to THC than humans. Signs may include wobbliness, dilated pupils, drooling, and lethargy. If your dog has eaten marijuana in any form, contact a veterinarian or animal poison-control service right away, even if your dog appears well at this time.

Before using any tool, contact a veterinary professional if your dog may have eaten marijuana or cannabis products.

  • US: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • UK: Animal PoisonLine (01202 509000) or your nearest veterinary emergency clinic
  • Canada: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • AU: Animal Emergency Centre or your regular vet
  • EU: Contact your nearest veterinary emergency service

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Safety Verdict

Toxic. Marijuana (Cannabis sativa and related species) contains THC, which acts on cannabinoid receptors in the brain and nervous system. Dogs are reported to be more sensitive to the effects of THC than humans, which means a quantity that produces mild effects in a person may cause more pronounced signs in a dog.

THC can be found in several forms that may be accessible to dogs, including the dried plant material, edibles such as baked goods or candies, oils, tinctures, and butter used in cooking. Edibles are sometimes associated with more serious cases because they can contain concentrated THC and may also include other ingredients such as chocolate or raisins, which are separately toxic to dogs. The ASPCA lists Cannabis as toxic to dogs, cats, and horses.

What Should the Owner Do Now?

  1. Contact a veterinarian or animal poison-control service immediately. Early assessment can help determine the right course of action.
  2. Do not induce vomiting unless a veterinarian or poison-control professional directly instructs you to do so. THC can affect coordination and consciousness, making vomiting potentially hazardous.
  3. Collect relevant information (see the section below) so the veterinary team can assess the situation accurately.
  4. Do not give food, milk, oil, salt, charcoal, or any home remedy. These are not proven treatments for marijuana exposure and may worsen the situation.
  5. Follow the veterinarian's instructions regarding examination, monitoring, or supportive care such as intravenous fluids.

Even if your dog ate a small amount and seems fine, professional consultation is still warranted because signs may develop over time and individual response varies.

What Signs May Occur?

Signs of marijuana toxicity in dogs typically develop within 30 minutes to a few hours of ingestion, though the timeline can vary depending on the form and amount consumed. Not all signs will appear in every dog.

Signs may include:

  • Wobbly or uncoordinated walking (ataxia)
  • Dilated pupils
  • Drooling or hypersalivation
  • Lethargy or drowsiness
  • Urinary incontinence or dribbling urine
  • Tremors
  • Vocalization or disorientation
  • Elevated body temperature (hyperthermia) in some cases
  • Sensitivity to sound or touch

In more serious cases, a dog may become very lethargic, unresponsive, or unable to stand. Absence of signs does not necessarily rule out risk, because the effects of THC can take time to fully develop.

What Information Should Be Ready?

When you contact a veterinarian or poison-control service, having the following details available can help them assess the situation more efficiently:

  • Dog's details: species, breed, approximate age, and body weight
  • Form of marijuana: plant material, edible, oil, tincture, butter, or another product
  • Estimated amount: best guess of how much was consumed
  • Other ingredients: whether the product also contained chocolate, raisins, xylitol, or other items that may be separately toxic
  • Time of ingestion: when the exposure occurred, or the window during which it may have happened
  • Current symptoms: any wobbliness, drooling, lethargy, or changes in behavior
  • Packaging: if available, any labeling that indicates THC concentration
  • Medical history: any pre-existing conditions or current medications

Provide honest estimates rather than precise numbers. The veterinary team can work with approximate information to determine the best course of action.

Differences That May Affect Risk

Several factors can influence how seriously a dog is affected by marijuana, but none of them allow for a reliable prediction of outcome:

  • THC concentration: Products with higher THC content, such as concentrates and some edibles, may be associated with more serious effects.
  • Body size: Smaller dogs may be at greater relative risk from a given amount, though toxicity has been documented across sizes.
  • Form consumed: Edibles may produce delayed but more pronounced effects, and may introduce additional toxic ingredients.
  • Individual sensitivity: Response varies between dogs, and there is no established safe dose.

Because of these uncertainties, any known or suspected ingestion should be treated as potentially serious.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service immediately if your dog has eaten marijuana in any form. Do not wait for symptoms to appear.

Emergency signs that require urgent veterinary attention include:

  • Severe lethargy or unresponsiveness
  • Inability to stand or walk
  • Tremors or seizures
  • Elevated body temperature
  • Persistent vomiting
  • Difficulty breathing

Non-urgent follow-up: If ingestion occurred some time ago and your dog appears normal, a veterinary consultation is still recommended to assess the situation and determine whether monitoring is needed.

FAQ

Is marijuana toxic to dogs?

Yes. Marijuana (cannabis) contains THC, which is toxic to dogs. Dogs are reported to be more sensitive to THC than humans, so amounts that seem small can still cause noticeable effects. Any ingestion should be discussed with a veterinarian.

Can a dog overdose on edibles?

Edibles can be a concern because they may contain concentrated THC and sometimes include other ingredients that are toxic to dogs, such as chocolate or raisins. A veterinarian should assess any ingestion of cannabis edibles, regardless of the amount.

How long do marijuana effects last in dogs?

The duration can vary depending on the form and amount consumed. Signs may begin within 30 minutes to a few hours and can last for several hours or longer. A veterinarian can provide guidance on monitoring based on the specific situation.

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Disclaimer

This article and the PawAI Toxicity Checker provide general safety information and cannot determine an individual pet's toxicity risk or replace a veterinarian or animal poison-control service. If exposure may have occurred, contact an appropriate professional promptly, even if your pet appears well.

Written by PawAI Lab