Children love their pets -- and for good reason. Creatures large and small teach, delight, and offer a special kind of companionship. A pet is certainly a great friend. After a difficult day, pet owners quite literally feel the love.There’s research showing that kids with family pets have higher self-esteem. Pets provide their owners 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 other people that are living alone. There is a medically approved class of therapy animals, mostly dogs or cats, that are brought to visit confined humans. Pet therapy utilizes trained animals and handlers to achieve specific physical, social, cognitive, and emotional goals with patients. The most popular pets are likely dogs and cats, but people also keep house rabbits, ferrets; rodents such as gerbils, hamsters, chinchillas, fancy rats, and guinea pigs; avian pets, such as canaries, parakeets, corvids and parrots; reptile pets, such as turtles, lizards and snakes; aquatic pets, such as goldfish, tropical fish and frogs; and arthropod pets, such as tarantulas and hermit crabs.