The first day when so many were killed...I think she was scare off before she could escape with a chicken. The tree-trimming folks delivered a load of mulch that day (didn't even hear them drive in the backyard), and where she entered the yard was very close to where they drove the truck in. Somehow she managed to get the gate open on th eother side of the house, which is where I found a partially eaten bird, and two more not eaten.
Somehow I don't think she was alone that first day, when seven were killed.
Since she's been gone, I've lost two more. One before I reinforced the fence and installed a stronger gate, and one yesterday. It's possible that this dog is actually jumping over the fence.
The woman hoarder told the animal control people that her dog wasn't the only one killing chickens, that the pit bull next door was also a chicken killer. The deputy told the owner to keep his dog locked up or he'd lose him. So it's possible he's the one jumping the fence, or perhaps one of the pack of dog down the road (owner-dumped, and about 14 of them).
I've had chickens for over a year and never lost any to outside dogs (a couple to dogs I had, and no longer have), but none from outside sources.
Discouraging to say the least.
Thank you all for your encouragement...this is a good group.