I'm not sure. One thing I did with Doc (I learned it from reading the training book by the Monks of New Skete) was sit behind him when he was sitting, with my legs straddling him, put one hand under his chin, where it meets the neck, hold it there and then stroke his chest with the other hand. They struggle to get away at first because this causes them to be submissive, but keep a hold, say no or eh-eh when they struggle and praise when they calm down and hold still. Then you can let them go when they are quiet. That really seemed to help with dominance and doesn't seem quite as extreme as rolling. I did this a few times a day for a week or two. I do it once in a while now and he doesn't struggle at all anymore.