My lab mix puppy spends everyday with me and has all of my attention most of the day. He gets lots of walks and playtime. The big thing is when he does something and I tell him "no" he will scrunch up his nose, let out a small bark and then continue doing it. If my husband tells him "no" he listens. What am I doing wrong? I feel that I say it stern enough but I am not always effective. I am really afraid he will become an aggressive adult who does not listen to me. I am having him neutered in 2 weeks and am wondering if this will help.