I have a little chihuahua that loves her play pen. Her food and water are kept in there, and whenever she wants alone time, so goes in and curls up in a blanket. Whenever we take her somewhere where she will have to sleep in someone else's house, we always pack her play pen, and she feels right at home. It takes some of the stress away from traveling with a puppy knowing that she has a place where she feels comfortable no matter where we are.