This was the perfect size for my 9 kg cavapoo. We traveled to CDG with him and the wheels were a big help as we navigated the airport terminals and went to the airport hotel. We had to walk quite a distance and take a short rail shuttle. I couldn't have done it without the wheels. The wheels attach and detach easily to load the crate onto the plane. Now that we have arrived we took the door off and he uses the crate as his little cave.