I love pets,dogs ,cats etc .pet or companion animal is an animal kept primarily for a person's company, protection, or entertainment rather than as a working animal, 
What's your favorite pet?
The domestic dog, the most widely abundant terrestrial carnivore
Why are they human friendly hence the use of pets?
Pets can give companionship to elderly adults who do not have adequate social interaction with other people
What other notable stuff do they do?
Interestingly,there are proof that they help humans recover from illness ,especiallyare brought to visit confined humans, such as children in hospitals or elders in nursing homes.  
Wow! They are truly brilliant!
Some of the most popular pets are likely dogs and cats; other animals commonly kept may include (but are not limited to) pigs, ferrets, and rabbits,etev