Hmm... I haven't read your story... but I guess it depends on how the film writer wants to show Chomper, maybe if they do a lbt where Littlefoot, Chomper and the rest grow up.. I guess they had to deal with the situation in another way, since Chimper as a full grown carnivore will probably stop looking at Littlefoot as a friend but more as a meal, it's hard to say who's the good guy and the bad in a predator prey relation, but it all comes down to the aim of the Land Before Time series that is children, and they don't normally think so much about this.. maybe if they do a more teenage targeted lbt, I know some people wouldn't like it, but it would bring other types of groups to get interested in the lbt movies...