Ketchup — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
Sugar, salt and onion powder in a small package. Not a treat.
Short answer
It's best to avoid them. While a tiny amount of ketchup flavoring might not cause immediate harm, ketchup itself is not a good treat for cats due to its sugar, salt, and potential onion powder. These ingredients offer no nutritional benefit and can upset a cat's stomach over time. Stick to treats made specifically for feline dietary needs, and if your cat ever eats a large amount of a ketchup-based product, watch for vomiting or diarrhea and check with your vet.