[mojo]

Please have her spayed. I couldn't agree more with everybody else. Do not leave your dog outside alone! Do a search. Dogs have been stolen, killed by other dogs, gotten by birds of prey, on and on.
Mine do not go outside alone ever. They go outside, I go outside.
Not trying to be harsh, but that was very irresponsible behavior, esp. since she was in heat. But hopefully now you know better and won't do it again.