I am involved with rescue and the ten to fourteen month age is when most dogs come into rescue because these issues pop up at about that time. They are bored and going through the teenage stage LOL. Always keep them in a crate when you leave is the best way to deal with it. When mine were young, I paid the neighbor kids twenty dogs a week to come over and play with my dog for thirty minutes a day during the week when they got home from school. Worked great! Plus walk before leaving, walk after, usually played fetch (its alot easier throwing the ball twenty times to wear him out then walking/running a few times a day), and we tried other things as well.

My male had the same issue. He did it when he was a tiny puppy and then we put up somedthing in his corner so he couldnt get to the wall and it stopped. Then, I would say when he was about eight or nine months, we woke up and there was a whole in a different wall. It is very frustrating. I sympathize with you.

Jill