Cracked Paw Pads is a relatively common problem for dogs. Dry climate, harsh terrain, or sensitive paws can all cause dog's paws to start to dry out and crack. Cracking can be very painful, and part of the difficulty in healing is that dogs are often on their feet/paws, which can slow the healing process.
Paw Wax is an excellent paw conditioner that helps keeps paws soft and provides protection from the environment. It comes in a flat tray that makes its application easier. More Paw Wax info
Cut Heal Pad Heal also provides protection, but is intended more for paws that are already cracked. It has water and germ resistant barrier that protects paws while they heal. More Cut Heal Pad Heal info
Dog Boots can provide some paw protection for dogs whose paws aren't healing quickly due to terrain. More Dog Boot info