Keeping Dog From Trying to Get Out of Yard?

My dog is a 5 yr old wonderful Chow/Lab mix. We live in a rural area, and we are responsible pet owners, shots are up to date, etc.

We have a fenced in back yard, and he has almost an acre where he can roam and play. We have a lot of logging truck traffic, so I fear for all dogs that are roaming free. Times are different from when when we were a child growing up in the country, you can't let pets roam free like you used to. A lot of people still don't get their pets rabies shots, etc. (which is a state law here)

The only problem we have is when there is a "female" in the neighborhood in heat. We have not been able to get him fixed and there's a dog from across the road that comes over to the fence and marks her territory and leaves. It works him up so, that he digs a hole and gets out. We catch him before he leaves the yard, but I wish my neighbors would not let their pets roam. How can I keep this "temptation" out of my yard? How can I make my four legged son not want a girlfriend? One time I sprayed vinegar where she sprayed, and that seemed to help some. Any other ideas?

By Denise