Not cat proof
I originally bought this for the size which I admit is perfect. However, I have found that it isn't great for cats with whom it is made for. On the first day, one of my cats had pulled the fabric filter off the top and left a poop on it for me to find. Also my other cat manage to pull the door off and he now proceeds to do this every time he uses it and sometimes also poops on that. So for size I would commend but it isn't sustainable with cats so I would not recommend.