When my ice dragon is on neutral and I get attacked by a piranna in the water, my dragon quickly decides to get the hell out of dodge, and flies far enough away that it is not even loaded in anymore for me. I have to use a console command to spawn a dino tracker from another mod (Since usually the one I bring with me is on the dragon itself) and run to wherever it decided to fly to. Not sure if this is something you would be able to fix, but figured I would bring it up.