Suspect poisoning? US: ASPCA Poison Control (888) 426-4435 · UK: 01202 509 000 · Severe symptoms → nearest emergency vet now.

My 2 kg, 12-week-old kitten just ate a teaspoon of mashed avocado flesh. Is her small size a bigger concern?

Cats · Emergency guide

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

Yes, her small size means even that tiny amount carries more risk. The toxin persin can cause vomiting and diarrhea, which can dehydrate a kitten quickly. Watch her closely for the next 12 hours for any stomach upset, lethargy, or loss of appetite. Make sure she has fresh water available. Do not give her any more avocado, and check that no pit or skin was involved—those are choking or blockage hazards. If she vomits more than once or seems weak, call your vet; kittens can go downhill fast.

Why avocado is harmful to pets

Avocado contains a toxin called persin which can affect the heart and gastrointestinal tract of dogs and cats.

The fruit flesh may cause vomiting, diarrhea and abdominal pain, while the pit can cause an intestinal blockage.

Why speed matters

Delaying care significantly worsens outcomes. Some signs appear hours or days later, so "looks fine right now" is not a reason to wait.

Signs to watch for

  • Vomiting
  • Diarrhea
  • Abdominal pain or bloating
  • Weakness or lethargy
  • Signs of gastrointestinal obstruction such as straining

What to do right now

  1. Call your veterinarian or an emergency poison line immediately
  2. Do not induce vomiting if a pit is suspected or if the dog or cat is showing signs of obstruction
  3. Rinse the mouth with water and offer small amounts of fresh water to dilute any remaining toxin
  4. Monitor for worsening signs and transport to a veterinary clinic as soon as possible
If your pet shows any of the signs above, go to the nearest emergency vet now and call ahead.

The step-by-step response, from the first minute to the vet visit, is in our Avocado Poisoning in Dogs and Cats emergency guide.

Open the full emergency guide: Avocado Poisoning in Dogs and Cats →