I am currently fighting my dog with the distance at sit. He wants to come to me when I give him the short tweet. He is solid with the heeling and sit. I put him back in the spot he was supposed to plant his butt to the ground. We have done this for the past week and still at a dead end. I am walking him as instructed and letting him be a dog. I catch him off guard and give him the tweet. He acts like he is trouble and wants to come to me.. Any suggestions? I just correct him but not harsh.