So, I am about to run We be Goblins. One of the players is an oversized goblin cavalier. They are the only one with ranks in ride, and will probably be interested in dancing with the Sqealy Nord. The original challenge was made with small goblins in mind, so is there any way to let the Cavalier ride it? Of course there is the Undersized Mount feat, but they're riding a large mount (the specifics of which are what meke the character fun), so it would be best not to have to waste their limmited number of feats. Also, is the rule juts that they can't ride innaproprately sized mounts? Because if not, a penalty might be the easiest option.
Make Sqealy Nord size Large...or grant the Undersized mount feat to the PC or PC's for free.
Personally Undersized mount and a larger than normal goblin sounds fracking HILARIOUS...
I'll probably go the route of a free feat. They'll likely never use it again, and it allows the others to try the challenge, as well.