Hey there flower,
I too suffer from cracked feet occasionally. I get pedicures every now and then to have them exfoliate the skin and get the dead tissue off. Also I'm sure you have tried vaseline with socks on, if not, it's supposed to help. For the cow and horse products you can get them at any farm and animal supply store like Farm and Fleet. You could also call a local veterinarian that deals with large animals and ask them if they have any on supply or where to get it. Good Luck!
Hugs and Angels,
Lynnette
DX - sle and carpal tunnel
RX - plaquenil, prednisone, etolodac, lisiniprol, hormones and lots of vitamins