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Unexpected changes in the appearance associated with animals, which include unusual size, scabies, feces tail or even other characteristic features, are the result of genetic mutations that occur naturally at all times. Mutations that people like are tried to keep to the greatest extent possible then. Lyons explains that each animal has a defined “basic plan of the body structure, and when the mutation takes place, people choose those who are their favorite”. The development of most feline breeds continues to be accelerating only in the past 75 years, plus dog breeds are actually developing for hundreds of years, as confirmed by Elaine Ostrander, chief researcher at the Department of Cancer Comparative and Genetics Genomics at the National Institute of Health ).