OnlyOrps, I was so tickled by your dog-and-henny show! I was going to ask if the puppy was a great pyr, and now I'm pleased to see I can still identify pyrs!
I had one, almost twenty years ago, who was also a rescue, and when we brought home chicks for the first time, she was there to meet them. Well… I say "meet", but she said "babies!" and promptly hoovered one into her mouth without making a noise. When we told her to drop it, she hung her head, spit out a dazed chick, and flopped down like we were the WORST dog parents EVER. She became an instant mother-slash-livestock dog to all of our poultry (ducks, one cranky old goose, and two rounds of failed chicken nuggets). We know for a fact she killed at least two raccoons, and on a night when she was accidentally locked out of the "poultry access" section of the yard, she put out an immediate alarm up from *inside the house*! I opened the door, out she went. Opened the gate to the fowl, and I swear I have never seen a dog move faster. Whatever was in the yard, it was BIG and had reflective eyes. It had killed a Peking boy, and gotten it all the way to the back fence by the time I got the gate open. She literally slammed into the fence in her attempt to "get" the thief, and then, when she was sure she couldn't get the intruder, carried the boy's body back to me with a mournful posture.
I swear she was depressed for days after… and she refused to come out of the poultry yard for *anything*. She would just stay curled up in the dead center of the space and all the birds would cuddlepile up to her.