"I have always had exercise balls for my small pets (usually hamsters or mice), and recently bought this ball for my new chinchilla. He LOVES to run into it, often slamming so hard into objects/doors/walls, that he pops the door right off. This can be a scary thing since he is still quite skiddish. I'm afraid if he gets loose, he'll take up hiding underneath some piece of furniture, and I won't be able to get him out again! So I improvised and put tape over the door, and so far, so good-no escapes. I wish they would come up with a better fitting door, that doesn't pop off so easily."
