I have a blue nose put pup. I am so happy to have purchased this. The collar we had on him would cause bruises before he would pull way too hard because he is not fully leash trained yet. The harness makes it easier to control him without causing any pain. They have a high pain tolerance but i still felt very uncomfortable with his other collar. With the harness the kids can even control him when they want to take him out or play. There is a locking mechanism on the straps which i really like because it keeps him secured much better.