Our 4.5 month Victorian Bulldogge started going through his juvenile behavior stage about 2 weeks ago. We started him in training at 11 weeks and he did unbelievably well for the first 6 classes. Suddenly he is so defiant for me and for the trainer. She used to be able to get him to do his commands if I couldn't but at the last class he completely ignored us both. At home he is a totally different dog. He will do all of the commands on first try and exceed the time limit for sit and stay etc. There is only one other dog in class and last night she asked to just walk around doing loose leash walking, sit, stay and leave it on our own away from the other dog and it made no difference. Please help! I am at my wits end. I need to know how to get my dog to listen to me the first time. Thanks for any advice!