The collie is a herding dog breed known for its intelligence, loyalty, and agility. Originally bred in Scotland for herding sheep, collies are recognized for their distinctive long, flowing coats and expressive faces. They come in two main varieties: the rough collie, which has a thick, long coat, and the smooth collie, which has a short, sleek coat. Collies are friendly and good with families, making them popular pets. They require regular exercise and mental stimulation to stay happy and healthy. Their strong instincts and trainability also make them excellent working dogs in various roles, including search and rescue and therapy work.