Well, I also really didn't want to allow a mechanic for singing and dancing tyranosaurs, all "We're Back!"

Seriously, though. I didn't really want the template to be applied to larger creatures, because they'd ultimately get the most use out of it. While an intelligent cat can be quite a challenge, and a tiger with tactics a condundrum, I personally would fear the dinosaur capable of strategy.

It'd be like trying to fight a giant that could swallow you whole.