Well, to be blunt, you can't breed a dragon with a myloc.
Two totally separate models, skeletons, animations, textures and def files that are completely incompatible with each other. While I think in theory you would be able to accomplish what you are trying to do, there are a lot of things that you are going to have to get right in order for it to occur. Doing it trial and error like you seem to be doing will probably never yield results I'm sorry to say. Even knowing how the system works, I would not attempt it myself.