The humble wiener dog's stubby little legs hold a clue to both human dwarfism and evolution as a whole, a new study says. The key is in a newly identified gene that makes short-legged dogs, like the dachshund, so short, according to the research.Geneticist Heidi Parker and colleagues at the National Human Genome Research Institute in Maryland compared 76 different dog breeds—both short and tall—looking for genetic differences that could be tied to leg length. And they found one—a mutation of a s