McNab is medium sized dog breeds originating from the United States. They weigh between 35-70 lbs. They are also known as McNab Border Collie, McNab Sheepdog, and McNab Herding Dog. They are used as herding dog breeds. They are considered to be ancestors of Border Collie. Its gait is smooth and ground covering. Their coat is smooth and short with distinct black or red and white markings. They are even tempered, territorial and faithful. They are friendly and get along well with children and other pets. They are reclusive of strangers.