Does anyone know if it is possible for the hair to grow back on the elbows. I have 2 labbies, Mayce, I've had from a puppy and Kayce is a "rescue". Mayce has no calluses at all but Kayce does. They seem to have gotten a little better since I've had her. The hardest thing she lays on now is the leather couch, ha ha! So is there anything I can use to help that along? Any thoughts?