 Such a pseudo-breed is used for registry and shelter/rescue classification purposes, and breeds such as the Persian cat.While not bred as show cats, some mixed-breed cats are actually pedigreed and entered into cat shows that have non-purebred "Household Pet" divisions.Show rules vary; Fédération Internationale Féline (FIFe) permits "any eye colour, all coat colours and patterns, any coat length or texture, and any length of tail" (basically any healthy cat).