Dwarfism is a genetic condition that may occur in humans and in many animals, including rabbits.
Small stature is a characteristic of neoteny, which may account (in part) for the attraction of dwarf animals.
Many small rabbit breeds have the dwarfing gene, but the Polish and the Britannia Petite are among those that do not.
They have attained their small stature solely through selective breeding of successively smaller generations (a process called dwarfing).
The following table includes rabbit breeds currently recognized by ARBA[3][4] or by the BRC[5] that have a maximum weight of 4 lb (1.8 kg).