CThanks! The dogs aren't out too often with the chickens & not when we are gone. They are definitely not left unsupervised now.
Today the chickens were inside though, so it wasn't them. It was quite strange since we have huge floor to ceiling windows and were home at the time. I would have thought the dogs would have heard a cat, so maybe it was a hawk. Hmmm...quite a mystery.
Thanks for your insight.
Cats are very quite and sneaky. A hawk would have tore the bird up.