A Pet can only supply physical interaction.
Electromagnetism is a branch of physics involving the study of the electromagnetic force , a type of physical interaction that occurs between electrically charged particles . Pet . Pets provide their owners ( or guardians ) physical and emotional benefits . Walking a dog can supply both the human and pet with exercise , fresh air , and social interaction . Pets can give companionship to elderly adults who do not have adequate social interaction with other people , as well as to other people who are living alone . Pet therapy utilizes trained animals and handlers to achieve specific physical , social , cognitive , and emotional goals with patients .