Yes — safe in moderation
Yes — rabbits can eat cucumber, including the skin. It’s hydrating and low in sugar, though it’s mostly water, so it’s a light extra rather than a nutritious staple.
Cucumber is safe, low in sugar and very high in water, which makes it a refreshing treat on a warm day. Rabbits can eat both the flesh and the washed skin, and even the leaves of the plant. Because it is so watery and low in fibre, though, it should not crowd out the hay and leafy greens that actually keep a rabbit’s gut and teeth healthy — too much watery veg can cause soft stools.
A couple of thin slices a few times a week is plenty, as part of the daily greens allowance. Wash it well to remove pesticides, and introduce gradually. Always keep unlimited grass hay available as the bulk of the diet.
Pair with leafy greens like romaine and herbs; for a treat, a sliver of apple.
General information, not veterinary advice. If your pet has eaten something potentially harmful or shows symptoms, contact your vet or an emergency clinic immediately. Full disclaimer.