First of all, I want to say that I'm really sorry for your loss!
Second, I want to say that I hate owners who:
1) Can't (actually won't) keep their dogs locked up.
2) Get dogs without doing any research on the breed.
3) Don't train the dogs to either stay home or be nice.
4) Leave the dogs outside (unattended) to run wherever they please. This usually happens with "outside" dogs.
5) and finally, won't do anything about it when their dogs do attack something!
Last summer we had a couple of huskies around the yard... A male and a female. We saw them before they got any of the chickens but they were DEFINITELY stalking them! We got a hold on them and called animal control who said that these dogs had been running all day and they had gotten multiple calls about them. One call was from a daycare center who was afraid of the dogs and hustled all of the children inside! We observed that the female was severely pregnant and could deliver any day! We found out later that the dogs had gotten out of the man's yard who owned them, while he was at work! They had gone a mile and a half in just a few hours! UGH!