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Hi. How come your hair's so short? Photo: star5112/Flickr Short, long, straight, curly, wiry, smooth or extra fluffy -- dog hair comes in a lint-brush-busting variety of lengths and textures. Now, researchers at the National Human Genome Institute have discovered that almost all the variation in dog fur comes from just three genes, as NPR reports. Elaine A. Ostrander, chief of the Institute's cancer genetics branch, studied the DNA of more than 1,000 dogs, representing about 90 different breeds, according to NPR. "You can go to the dog park, and every breed of dog looks different from every other breed, it seems. Yet, you know, when we get down to the molecular biology, we really find ...