Service Dog Training  

I am looking for information on how to best finish the training of my service dog, Shay. He is a 15 month old Newfie/Lab mix who I rescued from the shelter when he was 9 weeks. We have an awesome relationship and he goes where I go, to a point. I have MS and need him for balance, more than anything. He does like to bring me "presents", but these are usually limited to dirty socks and dead mice. We've been through puppy, basic, obedience and advanced obedience training classes, which is why he is so well behaved, but I am having difficulty getting him to bring me things that I NEED, like clean socks, my cane, my jacket, etc. (I have trouble bending down). Part of this is due to the fact that he wasn't allowed to touch most of those things when he was small. Any input would be greatly appreciated!