Review on Non-Pull, Waterproof, and Padded Vest Dog Harness for Service Dogs - Blue Color Coded Design Alerts Others of Dog's Working Status (Size S) by Trish Stott

Bought from XXS for my Chihuahua service dog who weighs less than 6lbs and fits her small size very well. It's not perfect, but it works the way I wanted it to - it would probably be perfect to wear over a t-shirt! ;) She jumps with this harness so I think she likes it too! This size will also fit a larger (smaller) dog - my other two dogs are 10.5lbs and 8lbs. (Only because of the size) I tried this on both and it worked great. I wish there were other color options but the blue is very good. The harness is well made and designed not to rub underneath.