A pet that is commonly kept by many people is often referred to as a popular pet. However, there are various synonyms that can be used to describe these beloved animals. Some of these synonyms include common pet, mainstream pet, household pet, widespread pet, and usual pet. Additionally, depending on the specific animal, other synonyms such as domesticated companion, furry friend, and loyal companion may be appropriate. It is important to note that while certain pets may be considered popular, each animal has its own unique qualities and characteristics that make them special and valued companions to their owners.