What is a rope attached to the halter for leading called?

The term "lead rope" specifically refers to the rope that is attached to the halter for leading a horse. This piece of equipment is essential for controlling the horse during handling and exercise. A lead rope is typically made of strong, durable materials and can vary in length, allowing for effective communication and security between the handler and the horse.

In comparison, the other terms listed refer to different equipment or do not accurately describe the specific function of the lead rope. A halter strap could imply the part of the halter that secures the halter around the horse’s head rather than the rope used for leading. A pull rope usually signifies a different type of rope used in various applications but is not specifically associated with leading a horse. Guide rope also does not align with common equine terminology for handling horses. Therefore, "lead rope" is the correct term for the rope used for leading a horse.