Cats can eat plain black olives in very small amounts, but they are not a healthy or necessary snack and can sometimes cause problems. The safest approach is to treat them as an occasional, tiny treat at most, and many vets recommend skipping them entirely in favor of cat-safe snacks.

Quick Scoop

  • Black olives are not poisonous to cats, so a seedless piece or one olive your cat steals is unlikely to be an emergency if your cat is otherwise healthy.
  • They are “empty calories” for cats and do not provide meaningful nutrition compared with proper cat food and treats.
  • Many olives are packed in salty brine or with seasonings (garlic, onion, chili, herbs) that can be irritating or dangerous for cats, so these should be avoided.

Safety basics

  • Only offer:
    • Plain black olives
    • Seedless (no pits, no slices with pit fragments)
    • No brine rinsed on only, or ideally offers are so rare you simply do not make olives a habit.
  • Skip olives completely if:
    • Your cat has kidney, heart, or blood pressure issues (extra salt is risky).
    • Your cat has digestive sensitivity or a history of pancreatitis.

If your cat eats a heavily seasoned, moldy, or large amount of olives and then vomits repeatedly, has diarrhea, seems very lethargic, or acts “off,” contact a vet or emergency clinic.

Why some cats love olives

  • Some cats react to olives a bit like catnip: certain compounds in especially green olives (isoprenoids) are similar in effect to the catnip compound nepetalactone, and black olives may trigger similar playful or “silly” behavior in some cats.
  • Typical reactions include:
    • Rolling on or rubbing against the olives
    • Licking and batting them around like toys
    • Brief excitement followed by loss of interest

This “catnip-like” response does not mean olives are good food; it just means your cat’s scent receptors are intrigued.

How much is “okay”?

If you do choose to let your cat taste black olives:

  1. Offer no more than:
    • A fingertip-sized piece, or
    • Up to half a small, plain, seedless olive, and only once in a while (not daily).
  1. Watch for:
    • Vomiting, soft stool, or gas
    • Excessive thirst or peeing (possible salt overload)
  2. Stop immediately and avoid olives in the future if there is any sign of digestive upset or behavioral change that worries you.

For kittens, senior cats, or cats with medical conditions, skip olives altogether unless a vet explicitly says otherwise.

Better alternatives to olives

Instead of black olives, consider:

  • Vet-approved cat treats or a few pieces of your cat’s regular kibble as a reward.
  • Small bits of cooked, unseasoned chicken, turkey, or fish (no bones, no skin, no salt or spices).
  • Catnip or silvervine toys if your cat enjoys that “happy, silly” reaction.

These options give your cat enjoyment without the added salt, oil, or choking risks that come with olives.

Information gathered from public forums or data available on the internet and portrayed here.