The seem to be in the waste, I remember Egwene seeing one in Tar, I think near Rhuidean, but I seem to remember them showing up two or three other times, though never more then a passing mention.
One of them might on been in the Traveling show...(goes to to the wiki to look up the name of the show) Oh.
Apparently it's called a capar.
http://wot.wikia.com/wiki/Valan_Luca%27s_Traveling_Show
http://wot.wikia.com/wiki/Capar
....Still not ringing any bells as far as RL animals go, though... Just seems weird that their would be a random exotic in the meddle of the waste(like how in the world did it get there?), so... Hyenas that WoT people insist looks more "pig-like" then I find them, or something that's evolved?