I don't how this happened, but I am devestated.Yesterday, I went and did an estimate for a very nice lady in a neighborhood where I do some work. I stopped in, she wasn't home, so I walked through the yard. In the backyard area, I was met by a little grey Terrier...friendly little thing, and I remember saying to him that "I'll have to remember to bring you some snacks." Well, anyway, I called her later in the day, gav her the prices, and she accepted. I told her I can cut it right now (in close neighborhood). She said fine, she's leaving, and she'll put her dog in. I went over and cut, and all went well. I just got a call from her, she was crying. She said that when she let her dog out, the gate had been left open, and her little dog must have gotten out (unknown to her). Well, they looked all day for it, and just found it. It had been hit by a car and killed. I feel so terrible. I don't know what to do, as nothing like this has ever happened to me - I don't even leave gates open, but I DO think I left this one open. What do I do?