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 ...

This designer breed emerged in the 1990s when small companion dogs were all the rage. A cross between a Chihuahua and a Yorkshire ... and their hair can vary from curly or wavy to soft or straight ...

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 ...