Due to recent cases happening to me and other people (see here), and due to the future implementations of aggressive animals (wolves and maybe more?), I suggest pushing the res files of these types of things to the client before the player even observes the animal.
I know this sounds a bit redundant, but it will prevent a lot of useless deaths. Dying by your own mistakes, whatever, but dying because you didn't have a chance to know you're in danger, that's a problem.