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Cannabis / Marijuana
Cannabis sativa
Cannabis (marijuana) is a growing household hazard for cats as its recreational and medicinal use becomes more widespread. The primary toxic compound is tetrahydrocannabinol (THC), which severely disrupts the nervous system in cats — both through ingestion of plant material or edibles, and through passive inhalation of smoke. Cats have a lower tolerance for THC than humans, and exposure can cause a frightening range of neurological and physical symptoms. Cannabis edibles present a compounded risk, as they frequently contain chocolate or xylitol alongside THC.
Important Notes
Symptoms: Stumbling and lack of coordination (ataxia), muscle tremors, hypersensitivity to light and sound, alternating profound lethargy and severe agitation, drooling, vomiting, and urine dribbling (incontinence).
Edibles are especially dangerous: Pot brownies and gummies often contain chocolate (theobromine) or xylitol — adding a second layer of toxicity on top of the THC.
CBD products: An overdose can cause vomiting and diarrhea; never self-administer CBD to a cat without veterinary guidance.
Action: Secure all cannabis products including edibles, concentrates, and vape cartridges out of reach. Contact a vet promptly if exposure is suspected.
Potentially Toxic Parts
Stem
Leaf
Flower
Possible Symptoms Reported in Cats
Tremors, Seizures, and Coma
Neurological
Ataxia (wobbly, uncoordinated movements) and Disorientation
Neurological · Signs manifest after the drug has been absorbed
Bradycardia (Slow Heart Rate) or Tachycardia (Fast Heart Rate)
Cardiac
Prolonged Depression (Sleepiness/Lethargy) or Hyperexcitability
Neurological
Mydriasis (Dilated Pupils)
Neurological
Urinary Incontinence (Urine Leakage)
Renal
Vomiting and Hypersalivation (Excessive Drooling)
Gastrointestinal
Hypothermia (Low Body Temperature) or Hyperthermia (High Body Temperature)
Neurological
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.