Our newest addition to the family a couple month old puppy. Keeps digging from inside our yard under our fence to get out and go to our neighbor's yard. Our neighbors who we received him from. He was depressed and is starting to now come around. Every time I let him out in the yard to do his business he manages to find a way out of our fence and run back to our neighbor who is a couple Doors Down. Our neighbor has the mom and one other Pup. It's not so much that we mind the dog seeing our neighbor for the mom, however we do want him to be trained to stay in the yard. I have looked up multiple ways of keeping him in the yard period to no avail nothing has worked for us. Help please..