It's my fault, but I'm still feeling sad about it. She had gotten out and was on top of her netted pen, but I didn't realize she was out, so the dog got out and jumped up and got her. I'm new to this, so now I know I need to make the pen sides higher. It's not the dog's fault - he was just being a dog. And the hen was young - about 10 weeks, so not a good enough flyer to get away. I'll do better next time, but this is a real bummer.