"A dog is a man's best friend." That common saying may contain some truth, but dogs are not the only animal friend whose companionship people enjoy. For many people, a cat is their best friend. Despite what dog lovers may believe, cats make excellent housepets. In the first place, people enjoy the companionship of cats. Many cats are affectionate. They will snuggel up and ask to be petted, or scrached under the chin. Who can resist a purring cat? If they're not feeling affectionate, cats are generally quite playfull. They love to chase balls and feathers, or just about anything dangling from a string. They especially