Cat Poisoning: Symptoms, Emergency Response & What to Tell the Vet

By Sarah Bennett, Certified Animal Nutritionist

Cats are uniquely vulnerable to a wide range of substances that are harmless or only mildly toxic to dogs or humans. Their liver lacks certain enzymes — particularly glucuronyl transferase — needed to metabolise many common compounds. This means everyday items like certain flowers, human medications, and even flea treatments designed for dogs can be acutely lethal to a cat. This guide covers the most dangerous toxins, how to recognise poisoning, and exactly what to do.

Top Poisons for Cats You May Not Know About

Plants

• True lilies (Lilium and Hemerocallis species) — kidney failure within 24–72 hours; even small pollen exposure is fatal
• Sago palm (all parts, especially seeds)
• Tulip and narcissus bulbs
• Azalea and rhododendron
• Oleander

Human Medications

• Paracetamol (acetaminophen / Tylenol) — a single regular-strength tablet can kill a cat
• NSAIDs (ibuprofen, naproxen)
• Antidepressants
• ADD/ADHD medications (amphetamines)
• Sleep aids and antihistamines

Household and Outdoor Products

• Permethrin (in dog flea treatments) — cats groom each other; applying dog spot-on to a cat or letting a cat groom a treated dog causes severe neurological toxicity
• Antifreeze (ethylene glycol) — sweet taste attracts cats; kidney failure within hours
• Rat and mouse poison (rodenticides)
• Bleach and concentrated cleaning products
• Essential oils (tea tree, eucalyptus, peppermint, citrus)

Foods

• Onions, garlic, chives (damage red blood cells)
• Grapes and raisins
• Xylitol (artificial sweetener)
• Raw dough
• Alcohol (in any amount)

Symptoms of Cat Poisoning

Symptoms vary by toxin type, but common warning signs include:

Neurological Symptoms

• Tremors, twitching, or full seizures
• Loss of coordination (ataxia), wobbly walking
• Dilated pupils
• Extreme agitation or, conversely, profound lethargy

Gastrointestinal Symptoms

• Vomiting (sometimes repeated)
• Diarrhoea, possibly with blood
• Drooling excessively
• Loss of appetite
• Abdominal pain (cat guards abdomen or hunches)

Respiratory and Cardiovascular Symptoms

• Rapid or laboured breathing
• Pale or yellow-tinged gums (jaundice)
• Weak or irregular pulse
• Collapse

Urinary / Kidney Symptoms (especially lily poisoning)

• Increased or decreased urination
• Straining to urinate
• Stopping urination altogether (acute kidney failure)

Emergency Response: What to Do Right Now

Step 1 — Stay Calm and Secure the Cat

Confine your cat to a safe room. Avoid further stress — a panicking cat is harder to assess and treat.

Step 2 — Call Immediately (Do Not Wait for Symptoms)

ASPCA Animal Poison Control: (888) 426-4435
Your emergency vet's number
Have both numbers pre-saved in your phone.

Step 3 — Gather This Information Before You Call

• The substance ingested (brand name, active ingredients, concentration)
• Estimated amount ingested
• Time of ingestion (or when you first noticed symptoms)
• Your cat's weight and approximate age
• Current symptoms, even if mild

Take a photo of the product label or plant. Bring the packaging to the vet — do not rely on memory for ingredient names.

Step 4 — Do NOT Induce Vomiting Without Expert Guidance

Inducing vomiting is appropriate for some toxins and actively dangerous for others (corrosives, hydrocarbons). The ASPCA Poison Control team or your vet will tell you whether to induce vomiting and how.

Step 5 — If There Is Product on the Skin or Coat

For topical exposures (permethrin, essential oils, cleaning products), wash the area immediately with mild dish soap and warm water. Prevent the cat from grooming until the area is clean. Cats ingest a huge proportion of skin toxins through grooming.

Step 6 — Transport Safely

Place the cat in a carrier lined with a clean towel. Keep the environment calm and drive directly to the emergency vet. Do not leave the cat unattended during transit.

What to Tell the Vet

Vets can treat poisoning much more effectively when they know the specific toxin. Tell them:

• Exact substance and quantity
• Time course (when ingested vs. when symptoms began)
• Any treatments you already gave (including attempting to induce vomiting)
• Your cat's full medical history and current medications