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Only one of my two cats ate a single salted pistachio kernel — do I need to worry about my other cat who didn't eat any?

Cats · Food safety

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

Short answer

You only need to focus on the cat who ate the pistachio. A single salted kernel might cause mild thirst or an upset stomach due to the salt, but it's not toxic. The main risk for the other cat is if shells are left around, as they can crack into sharp pieces and cause choking or internal injury. Check the area thoroughly for any leftover shells or nuts, and keep all human snacks securely stored away from all pets in the future.

Pistachios — Food safety facts

Feed with care · Cats · full breakdown on the linked food page

Usually salted, and the shells crack into sharp pieces. Avoid.

Dogs and cats carry the same rating (Feed with care), so the notes below hold for either pet.

Pistachios is not poisonous to cats, but it is easy to over-feed. Rich fat, salt or seasoning can bring on vomiting or diarrhoea within a day, and repeated large portions are a recognised trigger for pancreatitis.

If it ate some before you noticed, watch for vomiting, diarrhoea, loss of appetite, unusual tiredness or a painful, swollen abdomen over the next 24 hours. A one-off small amount in a healthy adult usually passes with water and rest; repeated exposure, a puppy or kitten, a senior, or a pet with an ongoing illness is a reason to call your vet the same day.

Why these cautions matter

A heavy salt load drives up thirst and urination, and in the worst cases leads to sodium ion poisoning, which is a genuine emergency.

The full verdict, portion guidance and serving notes are collected on the Pistachios food facts page.

Open the full food page: Pistachios food facts →