The short answer: call your vet or a pet poison hotline first
If you think your cat ate weed, the top move is a phone call to your veterinarian or a pet poison hotline, placed before you wait for symptoms to show. Marijuana toxicosis in cats is not usually fatal, but cats process cannabinoids slowly and small amounts of edibles or concentrates can cause heavy sedation, tremors, and a drop in body temperature. The criteria that shape the advice you get are: how much THC the cat may have eaten, the form (flower, edible, tincture, butter, or concentrate), the cat's weight and age, and how long ago the ingestion happened. Have the packaging in hand when you call.
Why cats react strongly to THC
THC binds to cannabinoid receptors in the brain and nervous system, and cats have those receptors in the same places dogs and people do. Cats also clear many drugs through glucuronidation pathways that are less efficient than in other species, so effects can linger. A dose that makes a large dog wobbly can leave a five-pound cat flat and unresponsive. There is no reliable published lethal dose for cats, which means no safe amount can be assumed.
Common symptoms, roughly in order
- Lethargy or depression, often the first thing owners notice
- Wobbling, swaying, or a wide stance when standing
- Dilated pupils that react slowly to light
- Vomiting and drooling
- Head tremors, muscle twitching, or a startle response to touch
- Urinary incontinence or unusual dribbling
- Low body temperature, felt as cool ears and paws
- Fast heart rate, or in severe cases a slow one
- Staring, disorientation, or a change in meow and behavior
Timing helps you judge urgency. Flower or a smoked-in room can produce signs within 30 to 60 minutes. Edibles, butter, and oils often take two to four hours, and the effects can last 24 to 72 hours because the drug is absorbed and reabsorbed through the gut and liver.
Signs that mean go now, not later
- Seizure activity or continuous tremors
- Breathing that is slow, shallow, or labored
- Unresponsive to voice or touch
- Body temperature that feels cold to the touch
- Repeated vomiting with nothing left in the stomach
Any of these puts the cat in the emergency category. Do not wait to see if it passes.
What not to do at home
- Do not induce vomiting unless a vet tells you to. Cats aspirate easily.
- Do not give human medications, coffee, or any stimulant to counter sedation.
- Do not force food or water into a cat that is unsteady or vomiting.
- Do not leave the cat alone on a high surface, stairs, or near water.
- Do not assume a small nibble is harmless. Weight matters more than volume.
What the vet will likely do
Expect a physical exam, temperature and heart rate checks, and questions about timing and amount. If ingestion was recent and the cat is stable, the vet may give activated charcoal to bind what is left in the gut. Treatment is mostly supportive: IV fluids, anti-nausea drugs, warming, monitoring of heart rate and temperature, and blood work to check organ values. Many cats go home after 12 to 24 hours of observation. Edible cases with chocolate, raisins, or xylitol in the mix need extra handling because those ingredients carry their own toxicity.
Prevention for cannabis households
Most cases come from a dropped bud, an open jar, or a cat licking a butter dish. Store flower, tinctures, and edibles in a latched, non-clear container inside a cabinet the cat cannot reach. Treat infused butter and oils like raw chicken: never left out, never on a counter edge. Keep the poison hotline number on the fridge so nobody has to search for it mid-panic.