My dog is digging around our cherry tree...its not that big of a deal usually with a tree...but this one is only 2 years old and really tiny. We keep putting stuff over the holes, but then he just moves across on the other side. one hole he got down and tore some roots. Is there any way to get him to stop digging? I'd rather him dig where he poops. But not by the tree...it really makes me mad. He has 3 different holes there around the tree... HELP!