Olaf is a mini hinny! That means his dad was a horse and his mom was a donkey. Olaf was rescued before he could be sold to meat. He was being sold by a petting zoo who severely abused him, causing him to be very afraid of humans. Don't let his size fool you, he has a history of being dangerously aggressive - chasing grown men out of his pen by running backwards and kicking them!
Olaf is learning quickly with +R and Force-Free. He's been taught several things in "sign language" so he can communicate when he wants people to give him space, food, affection, etc. This way, he doesn't need to be violent, he just has to ask, and we just have to listen.