It sure sounds like a dominance issue. Kaedyn was neutered later in his life too (5/6 years old). He still pushes me and actively competes for the alpha position. I had to go back to NILIF and let him know that he is absolutely not allowed to nip at me or steal my (the alpha's) food. I've found that if you let NILIF slide after a while, if the dog is dominant enough, he will try to gain the position of alpha again. Try going back to NILIF if you already haven't and let him know that he is NOT allowed to do things like that to you. You are alpha and you won't accept any of it.