This tiny designer dog is a cross between a Chihuahua and a Dachshund. First developed in the late 1990s, Chiweenies most often have the large, Chihuahua ears and long, low body of the Dachshund, but vary in their coloring and hair length. These dogs tend to be vocal, are generally easy to train, and are well-suited for indoor living, in apartments or larger homes.