Dont worry, just calm down! It sounds horrible, but it could just be a little scuffle.. this happens a LOT when adult dogs are introduced to new puppies in their home. Everything is different for Kodie, and he's probably just trying to teach her that he is alpha. Is Lucy hurt at all? What happened in "the attack"? was it just growling/pinning or did he actually puncture the skin and make her bleed?