A great Canadian product!
Use it right before a run by simply wiping it on your dog's paw pads, and it forms a breathable barrier that protects against cold, and salt. Make sure you rub it up between the toes of your dog, to prevent painful snowballs from forming!
Mushers Secret is also invaluable to use as a conditioner, used one or two times a week, apply right before your dog heads to bed, or into their kennel. The food grade wax will absorb into the paw pad, helping to prevent cracks and cuts. An ounce of prevention is worth a pound of cure.