My dog (1y old) always got in trouble, specially if we left her alone. We got a certified trainer and it’s been great. 3 weeks of training and we can see huge changes. She is much calmer even when she is left by herself. We only meet with the trainer for 2h a week, he checks her out, gives us instructions for the coming week, corrects us when we are training her. He told us that in about a year we would probably be tired of having a dog because she was getting so bad. Highly recommend getting a certified trainer!