The tail is both shortened and kinked in Japanese Bobtails. This being said, the Japanese Bobtails are generally healthy cats. Mudis are born with various lengths of tails from bobtails to long full length tails. Additional EF-2s were created, but no more were modified into "bobtails". American Bobtails are playful, social and moderately energetic. Japanese Bobtails also feature prominently in traditional Japanese painting. Mekong Bobtails are medium-sized cats, weighing from . Japanese Bobtails thus became the "street cats" of Japan. Karelian Bobtails can be either short-haired or long-haired. American Bobtails are a very sturdy breed, with both short- and long-haired coats. Most have bobtails, but they can have long tails. American Bobtails require two to three years to develop, slower than many domestic cat breeds. Although rare, bobtails do occur naturally, as in the Finnish Spitz and Karelian Bear Dog.