From the ArcaMax Publishing, Cats & Dogs Newsletter:
http://www.arcamax.com/news/catsanddogs/s-177152-869668
The Longhair or Persian cat one of the oldest breeds of cat,
originating (as the name would seem to indicate) from Persia (Iran),
although interbreeding of Angoras with native British domestic
longhairs in the 19th Century makes the true origin of the breed
unclear.
The breed was originally established with a short (but not
non-existent) muzzle, but over time this feature has become extremely
exaggerated. Because of this, many are prone to a number of health
problems specifically affecting their sinuses and breathing.
Because their fur is too long and dense for them to maintain
themselves, Persian cats need regular grooming. To keep their fur in
its best condition, they must be bathed regularly, dried carefully
afterwards, and brushed thoroughly every day.