All cats are required to be crated for the simple reason that they are more difficult to restrain and the chances of them escaping are considerably higher. When transporting dogs, we usually crate all dogs except when the owner is accompanying their dog, if the dog is too large for the available crate or if the dog is injured and crating is not possible. In these cases, we prefer that dogs wear a harness in order to be safely fastened and secured in our van. Dogs that show aggression towards people or other dogs will need to be crated in order to be transported.