This was driving me nuts! So I have talked to just about every doggy person I know, and one or two I don't ( two of these people were very helpful, one ran away screaming and one phoned the police!)
The Mexican Hairless is Xoloitzcuintli, one and the same and nothing at all to do with the the Chinese Crested. Please forgive me for being stupid but it runs in the family, honest!
Two interesting things I discovered about the Mexican Hairless - it has no premolar teeth and a normal body temperature of 40.5 degrees C!