Famously described by H. L. Mencken as "a half-dog high and a dog-and-a-half long," the Dachshund ranks among the most popular dog breeds in America. These short-legged, long- backed dogs are brave, bold and sometimes reckless, willing and ready to take on the badgers they were bred to hunt. To the surprise of their many fans, a 2008 study in the journal Applied Animal Behaviour Science named the Dachshund the most aggressive of all dog breeds. Dachshunds are active, fun-loving dogs, but they can also be hard to housetrain, willful and feisty, which might make them a poor choice for many families, particularly those with children. Dachshunds are also wary of strangers and tend to bark loudly when their suspicions are aroused – or because a leaf blew across the lawn. That tendency to bark at the least provocation is just one of many reasons a Dachshund cannot be left alone out in the yard or live outdoors (vetstreet.com).