Are Cannabis Plants Toxic to Cats and Dogs?

Introduction

As cannabis use becomes more mainstream with legalization spreading across the globe, pet owners may be curious — or even concerned — about its potential impact on their furry companions. With both recreational and medical marijuana  becoming more accessible, pets may encounter cannabis products or plants within their homes. But is cannabis truly harmful to pets like cats and dogs? Understanding the effects of cannabis on animals is critical to keeping them safe.

This article explores the science behind why cannabis can be toxic to pets, the symptoms of cannabis poisoning, and what steps pet owners can take to protect their animals.

MUST READ: What to Do If Your Dog Ingests Marijuana

Why is Cannabis Harmful to Pets?

The main component of cannabis that poses a risk to pets is THC (tetrahydrocannabinol), the psychoactive compound that creates the "high" effect in humans. While cannabis has medicinal and recreational benefits for people, it is not safe for animals like cats and dogs. In fact, THC can lead to significant health issues for pets, and its effects are often more intense for animals than they are for humans.

The reason for this heightened sensitivity lies in the way animals’ brains process cannabinoids, the chemical compounds found in cannabis plants. Dogs and cats have more cannabinoid receptors, specifically CB1 and CB2 receptors, than humans. When THC binds to these receptors in pets' brains, the psychoactive effects are much stronger, meaning that even a small amount can have a severe impact on them. Since pets’ brains are more sensitive to cannabinoids, what might be a mild dose for a human could be overwhelming or even toxic for a dog or cat.

Additionally, animals process THC differently than humans do, leading to prolonged effects. While humans metabolize THC relatively quickly, pets can experience lingering symptoms for several hours or even days, depending on the dose and their individual tolerance.

Do All Cannabis Products Affect Pets the Same?

Not all cannabis products impact pets equally. The type of product, potency, and how much is ingested can all influence the severity of a pet’s reaction. Here’s a breakdown of the risks associated with different forms of cannabis:

  1. Cannabis Flower (Bud): Dried cannabis flower has varying levels of THC, but generally, pets would need to consume a substantial amount of flower to experience extreme symptoms. That said, even a small amount can still cause disorientation or lethargy in pets.

  2. Edibles and Concentrates: Cannabis edibles and concentrated forms of THC, such as oils and tinctures, are significantly more dangerous to pets than cannabis flower. These products have much higher concentrations of THC, and if ingested, can cause life-threatening reactions in pets. Edibles can be especially dangerous because they often contain other toxic ingredients like chocolate or xylitol, which are harmful on their own and become even more dangerous when combined with THC.

  3. Cannabis Smoke: While secondhand cannabis smoke is generally less toxic than ingestion, it can still cause distress in animals. Pets in close proximity to someone smoking cannabis may become lethargic, disoriented, or experience respiratory issues due to inhaling THC. However, ingesting cannabis directly remains more dangerous than exposure to smoke.

How to Tell if a Pet Has Ingested Cannabis

If a pet consumes cannabis, symptoms of toxicity can appear within five minutes but might take up to 12 hours to manifest fully. The duration and intensity of these symptoms depend on the amount ingested and the pet's individual tolerance. Some common signs of cannabis toxicity in cats and dogs include:

  • Vomiting: Nausea and vomiting are among the first signs of toxicity and can help clear some of the ingested substance from the pet's system.

  • Hypersalivation: Excessive drooling is common and can be an indication of nausea or distress.

  • Dilated Pupils: Pets may experience altered vision or light sensitivity.

  • Low Blood Pressure and Low Body Temperature: A marked decrease in heart rate and temperature is typical as the pet's system slows down.

  • Seizures: High doses of THC can cause seizures, which is a severe reaction requiring immediate medical intervention.

  • Lethargy or Disorientation: Pets may appear unusually tired, confused, or unresponsive, showing difficulty in walking or even standing.

  • Incontinence: Some pets lose control over their bladder due to a lack of coordination and muscle control.

If your pet exhibits any of these symptoms, it is essential to seek veterinary care right away. Cannabis toxicity can be serious, and delaying treatment could worsen the outcome.

Treatment Options for Cannabis Toxicity in Pets

When a pet is suspected of having ingested cannabis, a visit to the veterinarian is crucial. Veterinarians can provide supportive care to manage symptoms and may offer treatments to help your pet detoxify. Some common treatments include:

  • Activated Charcoal: Veterinarians might administer activated charcoal to help absorb toxins in the stomach and prevent further absorption.

  • IV Fluids: Hydration is essential, and IV fluids can help flush THC out of the pet's system while stabilizing body temperature and blood pressure.

  • Anti-nausea Medications: Pets experiencing vomiting may be given anti-nausea medications to ease symptoms.

  • Monitoring and Rest: Veterinary staff will typically monitor the pet’s vital signs and watch for any signs of worsening, which can be crucial in preventing complications.

Related: What to Do If Your Cat Ingests Marijuana

CBD for Pets: Is It Safe?

While THC can be harmful to pets, CBD (cannabidiol) — another compound found in cannabis — may have therapeutic effects without the psychoactive risks. CBD has been shown to help manage conditions like arthritis, anxiety, and chronic pain in animals, especially older pets who struggle with joint issues. Unlike THC, CBD does not produce a "high" and is considered safe when administered in appropriate, pet-specific formulations.

However, it’s essential to purchase high-quality, independent lab-tested CBD products designed for animals, as CBD products formulated for humans may still contain traces of THC. Always consult a veterinarian before giving your pet any new supplements or medications, even if they are marketed as safe.

Preventing Cannabis Exposure in Pets

To keep your pets safe from cannabis exposure, here are some practical tips:

  • Store Cannabis Products Out of Reach: Lock away cannabis products, edibles, and plants in pet-proof containers or cabinets.

  • Dispose of Cannabis Waste Carefully: Leftover cannabis, including edibles and vape cartridges, should be disposed of in a way that pets can’t access.

  • Avoid Using Cannabis in Pet Areas: If you smoke cannabis, avoid doing so in areas where pets have access to minimize secondhand exposure.

  • Educate Friends and Family: If you have visitors who use cannabis, inform them about the risks to pets and encourage safe handling of any cannabis products they may bring.

Final Thoughts

As cannabis use becomes more common, pet owners need to stay informed about its potential risks for their animals. While cannabis may offer benefits to humans, THC can be extremely harmful to pets like cats and dogs. If you suspect your pet has consumed cannabis, don’t hesitate to seek professional help. With vigilance and responsible cannabis storage, pet owners can ensure that their pets stay safe and avoid the dangers of accidental ingestion

 

FAQs

  • Yes, CBD (cannabidiol) is generally considered safe for pets when given in appropriate doses. Unlike THC, CBD does not have psychoactive effects and can help manage conditions like pain, arthritis, and anxiety. However, it's crucial to use only CBD products that are specifically designed for pets and are lab-tested to ensure they contain no THC. Consult your veterinarian before giving any CBD to your pet.

  • If you suspect your pet has ingested cannabis, seek veterinary assistance immediately. Be honest with your vet about what your pet has consumed, as this will help them provide the best possible care. Treatment may include activated charcoal to absorb the toxins, IV fluids, and anti-nausea medication, depending on the severity of the symptoms.

  • To keep your pets safe, store all cannabis products in secure, pet-proof containers out of reach. Avoid leaving any cannabis products (especially edibles) unattended, and be cautious about disposing of cannabis waste where pets could access it. Educate household members and visitors about the risks, as many people may not realize how harmful cannabis can be for pets.

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This article has been reviewed by Steven Fiore, MD.

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