http://www.dogwise.com/itemdetails.cfm?ID=DTB740

This site is full of helpful books and DVDs. I just want to warn you that if Dozer is resource guarding outside the home I have a feeling he could be even worse IN his home if you bring a new dog into it. He could even see YOU as a resource that needs to be guarded. Hooch does. He is ok with dogs on the street unless they COME CLOSE TO ME.
just be really careful with the new dog. I wish you guys luck.