I actually have four of these and I don't know what I would do without them. They are great for both cats and dogs. For my cats, I will usually put them away when I know my parents might be over since they are not as fond of cars as I am. The largest version is big enough to put a covered litter box and a couple of feeding bowls in there. These cages often have two or three doors, all of which have pretty decent, sturdy closures on them. I only wish they would install a handle if you wanted to place a lock in it. I also have a small one which I am using to crate train my new puppy. There is also a plastic tray which easily slides out to clean. These things really stand up to the weather, too. My mom kept one in the bed of her truck so we could take the dog with us camping on the weekends. It went through sandstorms, heavy rain, and brutal sunshine. After about a year, it started to rust a little, but that's it.