I am so impressed with my dogs new PerfectFit harness. He tends to pull when we first set off for a walk and his old harness would cause him to cough a lot as it was sitting against his trachea. As he is a small dog, I worried about collapsing trachea and came across PerfectFit. I cannot believe the difference since using their harness. The Y shape avoids the throat area and has resulted in my dog having cough-free walks! What a game changer, well worth the investment. The fact it comes in three separate pieces and you can buy each piece as the dog grows is brilliant. Thank you!