This was the case for Jordan Skye, who was enticed by an advertisement for a "long-haired Chihuahua" at a reduced price of about $375. As the dog matured, it became clear it was not the breed ...

One question that tugged at Swedish researcher Carles Vilà is how dogs can have such a wide variety of phenotypes—imagine a tiny Chihuahua ... long hair. In fact, the variation among breeds ...