I chased a pitbull that belongs to the neighbor accross the street out of my yard today. I saw him jump the fence from my next door neighbor's yard into my yard. When I grabbed a stick and ran after him he jumped the fence into my front yard and ran to the his home accross the street. He's a juvenille dog and I think he was just wanting to play with hershey ( I don't know if she might be going into heat, but that might be possible.
I watched him climb the fence both times, and an electric fence would have stopped him.