The Mexican Hairless Dog is a rare, (almost) hairless breed of dog which can be quite variable in size. It is also known as Xoloitzcuintli or Xoloitzcuintle (the initial x is pronounced as an sh), Tepeitzcuintli or Mexican Hairless. Most owners of this dog call them "xolos" for short.
The breed ranges in size from about 10 pounds/4 kg to 50 pounds/20 kg, with an average body temperature of 104 °F/40 °C. Similar in appearance to a Pharaoh Hound, with a sleek body, almond-shaped eyes, large bat-like ears, and a long antelope neck, the Xolo is notable for its dominant trait of hairlessness. Many members of this breed are also missing several teeth. There is also a "coated" Xoloitzcuintle with a very short coat of hair, and individual dogs may exhibit varying degrees of head and body coats.
Mexican Hairless Dog. (2006, November 28). In Wikipedia, The Free Encyclopedia. Retrieved 08:47, December 10, 2006, from http://en.wikipedia.org/w/index.php?title=Mexican_Hairless_Dog&oldid=90719276
As far as porn is concerned
A mexican hairless is a slang term for a shaved pussy