Rabbits can eat some lettuces in moderation, but not all greens are equal. Dark, fibrous leaves like romaine are commonly fed as part of a varied vegetable rotation. Light iceberg lettuce is mostly water and offers little nutrition; it can also contribute to loose stools in sensitive rabbits, so it is a poor staple.

The old warning about lettuce sometimes refers to wild lactucarium-containing varieties or very rich portions introduced suddenly. Domestic rabbits usually tolerate appropriate cultivars when diet changes happen gradually and hay remains the majority of food intake.

A healthy rabbit plate still revolves around unlimited timothy or other grass hay, a measured pellet portion if your veterinarian recommends one, and a daily cup or so of mixed rabbit-safe vegetables per five pounds of body weight, split across meals. Rotate items like cilantro, parsley, carrot tops, and small amounts of kale or romaine rather than offering one vegetable exclusively.

Never give avocado, rhubarb, or alliums like onion and garlic. Limit high-calcium greens if your rabbit has bladder sludge history, per veterinary advice.

If your rabbit stops eating, stops passing stool, or has bloating after dietary changes, treat that as a possible gastrointestinal emergency. Rabbits can deteriorate quickly without gut motility. Call a rabbit-savvy veterinarian immediately.

When introducing lettuce or any new vegetable, offer a small piece, wait a day, and watch droppings. Steady appetite and formed fecal pellets are good signs before increasing variety.