Australian Cattle Dogs, also called Blue Heelers, were developed in nineteenth-century Australia to drive cattle over long, hot distances, which explains their stamina and weatherproof coat. They're compact, muscular dogs of about 35 to 50 pounds with a blue or red speckled coat that sheds moderately, and more heavily during a seasonal coat blow once or twice a year.
Heelers are sharp, loyal and often devoted to one person, and they tend to be wary of strangers. Herding instincts can show up as nipping at heels or chasing bikes and joggers, which matters on busy Jacksonville greenway paths. With training, a daily job and enough exercise, many are hardy companions that live 12 to 16 years. Drive and temperament vary from dog to dog.