I have a little Chihuahua mix that at some point in her life, must have gotten caught in a leash or other harness. I was told she panics on leash or harness. She has no problem with this harness, in fact, she is excited to put it on and puts her head through the opening herself. I love the little Velcro pocket on the back that holds her ID tags. This harness is light, quick, while being very safe and secure. She is also working on losing weight so the adjustability of this harness was very important to me and does not disappoint! Love this harness! If you need a light weight, slip on, clip, clip let go harness, this is the one to get.