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My 6 kg cat with a sensitive stomach ate some buttered collard greens from the holiday buffet table — will this likely give him diarrhoea or gas?

Cats · Food safety

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

Short answer

Yes, the butter and any seasonings are more likely to upset his stomach than the collard greens themselves. Plain, steamed greens are safe in small amounts, but rich fats and dairy can quickly lead to soft stools or gassiness in a sensitive cat. Watch for signs like a rumbling belly, more frequent trips to the litter box, or unusually smelly stools over the next 12-24 hours. Offer him plenty of fresh water and his regular bland food. If the diarrhoea persists beyond a day or he seems lethargic, call your own vet for advice.

Collard greens — Food safety facts

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

Steamed and plain is safe in small amounts.

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

Collard greens 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

Caffeine overstimulates the heart and nervous system, and pets clear it so slowly that tremors and restlessness drag on far longer than they would in a person.

Collard greens 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 Collard greens food facts page.

Open the full food page: Collard greens food facts →