Cattle Dog is a label rather than one breed. Most dogs carrying it are Australian Cattle Dogs, known as Blue or Red Heelers, or mixes with one, though Texas Heelers and crosses with Border Collies or Labs turn up too. The Australian Cattle Dog was developed in nineteenth-century Australia to drive cattle by nipping at their heels, which explains the stamina and toughness.
Expect a medium, muscular dog, roughly 30 to 50 pounds, with a short double coat that sheds moderately. Many bond tightly with one household, stay wary of strangers and need a task to keep their sharp minds busy. In Houston that usually means structured daily walks, training games and a cool indoor spot afterward. Mixes vary in size, coat and energy, so a dog's behavior tells you more than the label does.