http://www.yorkietalk.com/forums/gen...-you-boss.html
I was in the same boat as you. Snickers growled, and even bit someone. I followed this way and now Snickers is fantastic
It really helped and it also helped him get over his food agression. I stick my hand is his bowl everytime he eats and mess with him and he just moves over
I hope this can help you as much as it helped me. Good luck
It's a link to a thread I posted, with a link in my original post, that's the one you want