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My 5 kg cat with a sensitive stomach ate a few plain pasta noodles — could this cause diarrhoea?

Cats · Food safety

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

Short answer

It could, especially if she's not used to carbs. Plain cooked pasta is safe but can be hard for some cats to digest, leading to loose stools or gas within 12 hours. Watch for signs like more frequent trips to the litter box or a softer consistency. Ensure she drinks water to stay hydrated. If diarrhoea persists beyond a day or she seems lethargic, switch to her regular diet and contact your vet. Avoid any pasta with sauces, garlic, or onions, as those are toxic.

Pasta — Food safety facts

Safe to share · Cats · full breakdown on the linked food page

Plain cooked pasta is safe. Never with onion, garlic or pesto sauce.

Dogs and cats carry the same rating (Safe to share), so the notes below hold for either pet.

Pasta is not toxic to cats. The real limit is calories, fat and salt, so treat it as a small extra alongside the normal ration rather than a meal in itself.

There is no poisoning risk here, and the usual problem is simply eating too much at once: a heavy fat or salt load can bring on loose stools or a single vomit. Offer water, keep an eye on the pet for 24 hours, and do not induce vomiting.

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.

Pasta can stay on the rotation, but only as an extra mouthful: 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 Pasta food facts page.

Open the full food page: Pasta food facts →