There really is no difference between cat carriers and dog carriers. This one is a dog carrier, but works perfect for what I need. Jax seems to like it too. Carriers are important to use while traveling for a few reasons. First is for their safety. If you were to get into an accident, they would be more protected in a carrier then they would be riding freely in your car. Second, for your safety. When they are confined to a carrier, you don't have to worry about where they are and have them crawling in and on places they shouldn't be. You would not want them crawling under your brake and then you needing to use it.