Cucumber — Food safety facts
Safe to share · Cats · full breakdown on the linked food page
Safe and hydrating. Low in calories. Peel or slice for very small pets.
Short answer
Yes, cucumber is safe for cats in small amounts. It is mostly water and low in calories, so it can be a hydrating treat. Just give a few plain slices, no seasoning or pickles. Watch for any signs of stomach upset, such as vomiting or diarrhea. If your cat seems unwell, contact your regular veterinarian.