Lettuce — Food safety facts
Safe to share · Cats · full breakdown on the linked food page
Safe and mostly water. Wash thoroughly and tear into small pieces.
Short answer
No need for concern; plain lettuce is safe for cats to nibble on. It's mostly water and provides little nutritional value for them, but it's not harmful. Just make sure the lettuce is thoroughly washed to remove any potential pesticides or dressings, and tear it into small, easy-to-chew pieces. Some cats enjoy the crunch. If your cat ate a large amount and seems unusually full or has soft stools, just keep an eye on it and offer plenty of fresh water.