So, today at around 4 pm I noticed that Athena was favoring her right hind. There didn't look to be any swelling but she was obviously very lame on it. It almost looked like when she did put weight on it that her fetlock joint was popping back into place. I called and made an appointment with my vet for tomorrow morning. They don't seem too worried and believe it's just an abscess. Now, she can hardly walk and can't straighten that pastern out at all. And there is quite a bit of swelling on the joint along with swelling on her other hind for overcompensating. Any ideas what this could be? First video is when I first noticed. Second is 2 hrs later.