I know exactly how you feel! One day, Duke got loose and I could hear him sort of screaming. There's lots of woods around behind ours and the neighbor's houses. I was also worried because the garbage men were there and I thought he had gone to them and they had hurt him. Turns out, a few doors down, he had encountered a kitty through a fence and it was slapping at his muzzle with it's claws. Boy was I relieved. So, I sure can sympathize with you.