Have you been getting a lot of rain? I know I have. I have never had an issue with either of my horses hooves, but this year I have had 2 abscesses and a huge split has now formed on the front hoof of one of my horses. The farrier said that the split was due to moisture being trapped in the hoof and it breaks down the fibers in the hoof wall…i highly recommend Kopertox and turpentine. Both stay on fairly well in the pasture too. Just apply daily.