We all love to have a pet, a dog and a cat is man's best friend. dogs and cats are very different animals and they have different attitudes, needs, and habits. understanding these differences can help in choosing between them. for unwavering love and loyalty, not to mention protection, a dog is the choice. For many people, a cat is their best friend. Despite what dog lovers may believe, cats make excellent house pets as they are good companions, they are civilized members of the household, and they are easy to care for.