Neighbors in part. One of mine may have participated. Attacks appear stimulated by change of setup. I brought some birds up by house which had not been done for a couple of years. One of my dogs clearly has a concept of where the birds are supposed to be. He is has matured into a very good dog that is smart as can be but had a back slide. He and I will have to upgrade out communications. The neighbor's dog takes carcasses home and eats them.
This event light loss but came when no plans to breed. Plans must now change. Losses all to one line here products of four generations of line breeding diminished. Three remaining pullets will have to be put in with their great-great-great-grandpappy to give me another couple dozen pullets to choose from. This bunch more fun than I like because they are prone to show game as chicks more often than not.
My wife and kids helped me clean up mess and do changes to fencing. That was first time we all got to do something like that together. Eldest kid still only 5. Good feeling.