My little Pomsky outgrew his baby harness and I didn’t want to use a collar, because he is somewhat an escape artist. I had a vest style harness that was just too bulky for him. This harness freed up his range of motion, allowing for a much more natural gait, slightly lower weight, and seemed to be way more comfortable for him to wear for longer durations. Highly recommended, awesome build quality and fit (and adjustable!)