Join Date: Oct 2014
Location: Central Hill Country Texas
I'm assuming that she wasn't rearing prior to purchase.
Is it possible that her back is hurting, yes. I would just not ride her until the vet has a look. You don't want to put the thought into her head that riding = pain or that a good way to get a rider off is to rear up.
“You spend your whole life with horses and just about the time you think you have them figured out, a horse comes along that tells you otherwise.” –quote from my very wizened trainer