Sheep Dog on an adoption listing describes a type of dog rather than a single breed. It usually means a herding dog, or a mix of one, from the family that includes Border Collies, Old English Sheepdogs, Shetland Sheepdogs, Australian Shepherds and Collies. Shelter staff often use the label when a dog's build, coat or herding behavior points that way, so adopters will meet everything from sleek, 35-pound Border Collie mixes to shaggy 90-pound Old English types.
What these dogs tend to share is a quick mind, close attention to their people and an instinct to gather and control movement. Many are sensitive, energetic and happiest with a job, whether that is herding, dog sports or daily training. Without enough to do, some turn that drive on children, bikes or cars, so structure and exercise matter.