A Skinny pig is a hairless Guinea pig. Skinny pigs typically have hair on their paws and at the crowns of their heads, but are nude over the remainder of their bodies. The modern skinny pig breed was the result of a spontaneous genetic mutation in inbred laboratory strains from Hartley stock at the Eastman Kodak Company in 1979, and henceforth was deliberately reproduced by Charles River Laboratories in a strain that had an intact thymus.[1] It is unclear which laboratory strains became the foundation of the pet skinny pigs now common among owners and breeders.
-Wikipedia