The type of animal commonly kept as a household pet, known for its loyalty, is the dog. Dogs have been domesticated for thousands of years and have developed an exceptional bond with humans. Known for their loyalty and companionship, dogs come in various breeds, each with unique characteristics and temperaments. They are often called "man's best friend" due to their affectionate nature and protective instincts. Dogs also play essential roles in families as service animals, therapy dogs, and working dogs, further proving their versatility and loyalty.