There are three main types of locks that are commonly used on rabbit hutches: padlocks, bolt locks, and combination locks. Each has its own advantages and disadvantages. Padlocks are the simplest type of lock, and they can be easily opened with a key. However, they are also the most likely to be broken open by determined burglars. Bolt locks are more secure, as they require two hands to open: one to hold the bolt in place while the other unlocks the door. However, they can be difficult to operate if you have small hands. Combination locks are the most secure type of lock, as they cannot be picked or broken open. However, they can be tricky to use if you forget the code. Ultimately, the best type of lock for your rabbit hutch depends on your personal preferences and needs.