Mine got hock sores on the regular before his stall was matted. Now that he has mats, he gets them very, very rarely. The hair will get matted down and sometimes he'll lose some hair over the hock, but it's been a while since he's had a bad sore. Call me crazy, but I take exception to my horse having large, bleeding/oozing ulcers on his hocks. Maybe it's because I'm vain and he's a show horse, but I raised hell when his hocks looked like that. FTR I don't think that those shown on Panda look anywhere near as bad as what I was dealing with. Those are quite minor and I imagine they'd heal over quickly if she was on softer ground or lay down less often.