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Can a handful of fresh blackcurrants give my 4 kg cat diarrhoea or an itchy skin reaction, even though they're safe?

Cats · Food safety

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

Short answer

Yes, the sugar and fibre in a handful can absolutely cause loose stools or gas. True allergy with itchy skin is rare, but any new food can upset a sensitive stomach. If she's never had them before, start with one or two berries to see how she tolerates them. Watch for changes in her litter box over the next day — softer stools mean her system isn't happy. If she's just eaten a bunch, offer plenty of water and her normal food. Call your vet if the diarrhoea lasts more than 24 hours.

Blackcurrant — Food safety facts

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

Safe in small amounts; the sugar content adds up quickly.

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

Blackcurrant 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

Added sugar brings empty calories, and over months that means weight gain and dental disease — both far harder to undo than to avoid.

Blackcurrant 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 Blackcurrant food facts page.

Open the full food page: Blackcurrant food facts →