Start with assertive and positive training
of both
dogs. Get a clicker and a large bag
of small treats that they will only get from your hand, and only when they do a good thing. First, you want both dogs to LOOK AT YOU when you click, and when they do this, treat them immediately. When you are in any situation that is upsetting for your doxy, click, treat and draw his attention to you. Encourage him to look to you for his every need, be it comfort, excersize, play.