I am using the Playpen at the office as a way to keep baby safe while I am busy. It is also a wonderful, safe way to let the pup and the older dogs get used to each other - the older dogs can see and smell, but not touch the new puppy, and the new puppy can have a positive first experience with the other dogs and cats. When the puppy is older, just roll a side up and let her come and go as she sees fit. It can then be a giant kennel (until she out-grows it if she is a big breed, or matures beyond it's purpose.