So sorry for your losses as well. how horrible that you have to put up with your neighbors dog which your neighbors can't control. We had a similar issue with our neighbors dog. She attacked my dog, Brox (my aussie), in my yard. then after he healed about 6 weeks later (he got a terrible infection, costed us a few hundred), she tried to attack him again (this after I went and had a talk with them about her needing to always be on a leash if she is outside). I grabbed him up in my arms and held on tight. I was hysterical. I was on my knees holding him and crying. my husband was trying to make me give Brox to him, the neighbor man was just standing there, he is in his 70's, no way can this couple control this pitbull. So after that I fenced in my whole back yard. all 3.5 acres. My puppies can't get in the front yard. My chicken coop and chickens when they free range are in the back yard. It is a horrible place to be in when your neighbors do nothing.