Cattle Dog is a label more than a single breed. Most dogs carrying it are Australian Cattle Dogs, known as Blue or Red Heelers, or mixes with one. The breed was developed in Australia to drive cattle by nipping at their heels, and it shows: medium, muscular, short-coated dogs that run on stamina and a sharp mind.
In DC, that means a dog who does best with daily structure: a long morning outing, some training or puzzle work, and a household that's home enough to include them. Many stay reserved with strangers and may try to herd bikes, joggers or kids, so leash manners matter on crowded sidewalks. Mixes vary in size, energy and coat, so how a dog behaves day to day tells you more than the label does.