A dog is more useful for tracking down criminals. A dog might actually take a bath of its own accord. There's more chance of your dog being able to operate the video recorder. You can buy a choke-chain for a dog. A dog is easier to keep well- groomed.
Dogs have more chance of receiving an award for bravery.
Dogs are easier to house-train. Dog do not scratch themselves so much in polite company. A dog can look as though it understands what you're saying. Dogs went into space first. A man will roll over and play dead only if you ask him to get up and make coffee.