For several centuries there have been hairless dogs in western Mexico and in coastal Peru  It is very unlikely that a trait as rare as hairlessness emerged on two separate occasions
Since the dogs have never existed in the wild, and the vast mountainous jungle separating these two regions would have made overland travel between them extremely difficult centuries ago, the dogs must have been transported from one of these regions to the other by boat, probably during trading expeditions
Hairless dogs have never been found anywhere except in the regions of western Mexico and coastal Peru.