Lettuce is a leafy vegetable that most people assume rabbits love to eat. It often comes as a shock however that most lettuces are not good for rabbits at all, and iceberg lettuce in particular is very bad for them to eat.
So, can rabbits eat iceberg lettuce leaves, stalk, core, or any other part of the vegetable? Absolutely not, it’s all bad news. You may have fed your rabbits some before without issue, but it’s really not a good idea. Lettuce contains a property called laudanum. This is harmful in large quantities, and even in small quantities can cause some bunnies some serious gastric issues.
The ideal balance of food for your rabbit it plenty of good quality Timothy Hay, some pellets, a cup full of quality fresh vegetables daily, and fresh water. Anything else should be given in moderation to mix up their overall diet a little. When trying new foods always air on the side of caution if you’re not sure about anything and introduce them slowly and one at a time.