Right, I don't imagine the problem is the size of the dog but rather the legth and density of the coat, especially around the neck. I have put a barker collar on Gracie (Sheltie) before, and have my groomer shave a path around her neck for for it. Works well until the hair coat starts to grow back. Sammy has a sparse coat so I think IF will work well on him. And I believe they do the installation, so no worries on that account.