I bought this coat for my 1yo border collie to be ready for the cold winter ahead and we put it to the test for the first time today. My dog is usually harness-shy so I was afraid he would be upset about having a coat on, but it is so easy to put on and off that the whole operation took no time at all! Barley is free to run, jump, and chase after squirrels with complete freedom and zero chafing. Also, the color and reflective trim will prevent hunters from thinking my dog is a badger, so extra points for that.
For reference, Barley weighs 40lbs and measures 26.5" around the chest - size S fits him perfectly