Yes, but I think part of the problem is that you aren't explicitly told, but you are SUPPOSED to reset your character's growths whenever you run out of bonus XP. This is why its faster to train a single PC at a time than 2/3. Since the game DOES split XP without telling you. Genuinely once you get the shark you should bench the other two and get her up to the 60s or 70s since both the Fox and Cow are substantially weaker than the shark/wolf/lion from what calculations I've done.