I feel in River's case sometimes I have to let him be a sheltie. He loves to alert to any excitement, even on the tv. i could train him to stop with treats and positive reinforcement for being quiet. I could have him march around like a little soldier, but I wonder if it would take an emotional toll on him to have to suppress his natural reactions. It would be like telling a talkative, enthusiastic person to be quiet all the time. I've always allowed my shelties to express themselves within reason. I knew they were barkers, and could be excitable....and I've still taken them on four times now. LOL I do find with River he is solid as a tank, he never is timid even with stern reprimand. He was like that from a puppy. He is not defiant, he just has a strong will. He is not one of those who hesitates to follow a command or is stubborn about it...my three girls were. I don't mind when he dashes at the window after a motorcycle that goes by and woofs once. I encourage him when he does that, hoping that he will learn that it's the hysterical, off the wall barking that I object to. It seems to be working slowly over time.