Can Cats Eat Dog Food?

Updated 18 October 2026 · Researched against PDSA, Cats Protection and International Cat Care guidance

Cats are obligate carnivores with requirements dogs do not have: taurine, arachidonic acid, preformed vitamin A and much more protein. Dog food is formulated for a different species and falls short on all of them.

Taurine deficiency in cats causes a form of heart disease and a retinal degeneration that can lead to blindness, and it develops quietly over months. A cat nibbling a dog's bowl occasionally is not a crisis; a cat living on dog food is a slow, preventable illness.

What to watch for in the UK

• Multi-pet households are the usual setting: the cat finishes the dog's bowl.
• Some dog foods contain onion or garlic powder, which are toxic to cats.
• Dog treats are not cat treats — they are often too large and too salty.
• If a cat is stealing dog food regularly, it is often a sign the cat's own food or feeding arrangement needs reviewing.

If your cat has already eaten it

1. A mouthful: nothing to do.
2. Regularly eating dog food: switch back to complete cat food and mention it at your next vet visit — taurine deficiency is not visible from the outside.

Out of hours, use your practice's emergency number. If you can, take the packaging with you — the ingredient list often tells the vet more than the description does. This page explains risk; it cannot diagnose your cat, and it deliberately contains no doses or home treatments.

If your cat is already vomiting, see the cat vomiting guide and vomiting blood. For the wider red-flag checklist, use sick cat symptoms. If a plant rather than a food is involved, the toxic plants checklist is the right page.

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