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My 5 kg cat ate a few stale, plain potato chips that were left out in a bowl overnight — is the spoilage a bigger issue than the salt?

Cats · Food safety

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

Short answer

The spoilage is the main concern. Stale chips exposed to air can grow mould or bacteria you can't see, which is more likely to cause vomiting or diarrhoea than the salt content from a few chips. Watch for signs of gastrointestinal upset over the next 12-24 hours: vomiting, loose stools, or a lack of appetite. Offer fresh water to help flush her system. If she acts normal, she'll likely be fine. However, if the chips were flavored with onion or garlic powder, that's a separate toxic risk — call your vet if you see lethargy, pale gums, or weakness, as these can indicate onion family poisoning.

Chips / crisps — Food safety facts

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

Salt, fat and usually onion or garlic powder. A single plain chip is not an emergency.

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

Chips / crisps 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

Garlic and onion damage a pet's red blood cells and can bring on anaemia. Signs are often delayed for several days, so looking fine straight afterwards does not rule it out.

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

Rich, fatty food is the classic trigger for pancreatitis, a painful inflammation of the pancreas that usually needs veterinary treatment rather than rest alone.

Chips / crisps can turn up now and then, but not as a daily habit: keep the rest of the day's food unchanged and watch the litter box and how quickly they finish the next meal.

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

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