I say ask before joining. Most fc I've seen have established ways to deal with such things. Just ask how they deal icly with chars of people who left because they didn't click oocly.
I think ostrich would be more accurate, too.
Also, (not to be mean, but trying to help you learn) the child of a horse is called a foal, if it's male, it's a colt, if it's female, it's a filly.
It'd be great if we could get the thing with the names that Lotro have. You have a yellowish name if not in rp, and white when in rp, and to change your status, you just type /rp or /rp off. It's awesome, and I'd love it if we could get it here.