This video solves the problem of getting the right crate for your puppy. You should visualize the size of your puppy after six months and get a crate of that size. If you have a mature dog, get a crate in which the dog can move and turn around easily. The presenter recommends a plastic crate. It is designed well. The door can be opened in both directions. The top can be removed easily and there are holes for the air to come inside. The wire cage is not recommended. Its door is fixed and the cage has very sharp corners. The dog can put his paws outside the cage causing damage to nearby things. The crate must allow the dog to sleep properly inside it. So, use a plastic crate with the size according to the given tips.