Complete the below form with your dogs information and I will select the correct size harness for your dog. Too much information is a good thing in this case, as it allows me determine the correct size and fit, for now and the future. Does your dog wear a coat in the winter? Is the coat under or over the harness? I expect the harness to last many years and I want to ensure the harness will work for you and your dog in all conditions. Does your dog get hot easily, maybe a Mesh harness is best? I will get back to you with the size I suggest.