Hello! I have a five month old pekin duck and recently I noticed that his back nail is no longer there and it has dried up blood. I don't know how or when this happened he spends most of his time inside my house and I can't think of a specific situation that could have caused this. Please help! Is this serious?? What should I do? He doesn't seem to be in any pain, he is walking just fine and is acting as he usually would. Help!!