A pet is an animal that is kept by humans for companionship. The most common pets are dogs and cats, but rabbits, guinea pigs, mice, fish, birds, and other creatures are also commonly kept as pets. For a very small pet, a cage, aquarium, or terrarium may provide enough space to move about, but larger animals need more room.
See also: Pet obesity
Pet obesity is a growing problem in the Western World.
In 2015, The Guardian reported concerning the United Kingdom: "Fat cats – and dogs and rabbits – are expected to outstrip healthy ones within five years, as pet obesity rates continue to rise across the country..."