Use Bag Balm on the callus's. It softens them fairly rapidly. Can get it at feed stores and Walmart used to have it. I haven't looked recently. I give my 11 yr old dane liquid glucosamine, chondroitin, and MSM in his water daily. I also give Lugol'sIodine and Colloidal Silver and gold. The Colloidal Gold is especially good for arthritis. I give 2 tsps of each CS and CG.