I have a Border Collie who will be turning 1 this weekend. He did extremely well in puppy & obedience classes. He is in a Novice now & acting like he has never heard commands before. He doesn't want to listen & would rather pull & play with his leash. We practice at home almost every day & usually more that once each day. First people said it may be due to a new environment but he has had 5 classes. I was also told he may be regressing, what can I do & How long should I expect the regression to last? Will it be as long as he is in the adolescence stage? He has acted like a different dog in this class compared to others that has taken, to tell the truth it has been embarrasing & very fustrating. Oh, and yes he was neutered around 6/7 months.