This page is about domestic animals, the Commodore PET was a home computer of the 1970s
A pet or companion animal is a domesticated animal that is kept by humans for companionship or for the beauty of its appearance or utterances, rather than for economic reasons.
While in theory one could keep a blue whale as a pet, in practice a small number of species of mammals and birds have dominated the pet scene for a very long time. Fish have joined them more recently. With the exception of iguanas and non-venomous snakes, few reptiles and amphibians make good pets.
The glofish, a genetically-modified zebrafish with a bright red florescent color is the first genetically modified (GM) animal to be engineered as a pet.
Fish - see Aquarium
See also: digital pet, How to choose your pet and take care of it