I've had a neighbor's dog kill my free-range chickens before. I didn't get too upset because that's just what bird dogs are born to do and I expect losses with free-range birds.
If I caught a dog actually in my coop eating chickens, though, I think I'd call the owners to come and pick up the...
Glad you at least caught the culprit.
There's a woman who walks her Springer spaniel around here without a leash, and it's gotten into our chickens three times. The first time I was very understanding - that's just the nature of bird dogs, and you have to expect some losses with free-ranging...