TL;DR: Marijuana ingestion in cats causes significant neurological distress due to high sensitivity to THC; while rarely fatal, you should contact a veterinarian immediately for guidance and potential treatment.
What happens when my cat eats a marijuana plant?
When a cat chews on or ingests parts of a marijuana plant (Cannabis sativa), they are exposed to THC (tetrahydrocannabinol), the psychoactive compound that causes intoxication. Because cats have more cannabinoid receptors in their brains than humans, they are significantly more sensitive to the effects of the plant, which can lead to neurological and physical distress.
Is it an emergency if my cat ingests marijuana?
- The urgency level for marijuana plant ingestion is generally Medium.
- While ingestion is rarely fatal, the symptoms can be quite severe and uncomfortable for your cat.
- You should contact your veterinarian or an animal poison control center immediately to discuss the amount consumed and any symptoms your cat is exhibiting.
- Medical intervention may be necessary if your cat is extremely lethargic, unable to walk, or showing signs of respiratory distress.
How does taking a photo of the plant help with my cat's treatment?
- Providing your veterinarian with a photo of the plant and the damaged area can be incredibly helpful for triage.
- Since different parts of the plant (such as the buds versus the leaves) contain varying concentrations of THC, seeing exactly what was consumed is vital.
- Photos allow the medical team to better estimate the potential severity of the toxicity and choose the most effective treatment plan.
Clinical Context (Merck Veterinary Manual)
In cases where a cat has ingested marijuana, diagnosis can be supported by veterinary testing or human drug test kits. Differential diagnoses should include ethylene glycol toxicity, ivermectin toxicity, hypoglycemia, benzodiazepine, barbiturate, or opioid overdose, intervertebral disc problems, and head trauma. Treatment primarily consists of supportive care; if recent ingestion is suspected and no contraindications exist, emesis should be induced, followed by activated charcoal administration. Comatose animals should be monitored for aspiration pneumonia, administered IV fluids, treated for hypothermia, and rotated frequently to prevent dependent edema or decubital ulceration. Diazepam can be used for sedation or seizure control. Treatment and monitoring should continue until clinical signs resolve, potentially up to 72 hours. In severely depressed animals, respiratory and cardiac stimulants may be required, alongside supportive therapy. The effectiveness of emetics may be limited due to the antiemetic effect of THC; oral tannic acid, activated charcoal, and saline cathartics have been recommended.
Chapter: Toxicology, Emergency
Source: The Merck Veterinary Manual, 11th Edition (Page 3041)