I stumbled upon the article
Managing Fear Agression here is an exerpt that might be helpful with the touching: (I posted the link at the end, the article has some other good points, as well as suggested reading.
Desensitize your dog to pats on the top of the head and shoulders. As you feed, pet the top of his head, the top of his shoulders. At first begin feeding before you touch, then simultaneously feed and pat, then pat first. Again hands going "pat, pat, pat" on your head is a great thing! Most dogs find this rude, I ask people not to pat my dogs on top of the head, but I have also gotten my dogs used to it should someone come up and pat them before I am ready. MANAGING FEAR AGGRESSION