These "Life Stages" crates work really well for house breaking puppies.  The adjustable insert is really helpful to not give them too much space while they are young.  A note to dog owners questioning the use of crates:  Never use to punish the dog.  We use when putting them to bed for the night or leaving the house.  Really it becomes their "bedroom" and keeps them safe so they don't get into trouble or even hurt themselves or damage things in your house.  Our dogs will actually seek the enclosed space when they want to relax or be left alone.  They are after all, denning animals.