Keeping the hair trimmed way back is very important in cold weather. Booties help too, once your dogs learn how to walk with them on. Use your electric trimmer if you have one, and trim the hair in and around the pads on your dog's feet. Otherwise, use round tipped sharp scissors to do the job. Trim right down to the skin, as close as you can get without injury to the dog.
Many sled dogs wear booties on a regular basis.
It is important that they fit properly, and that they are constructed out of proper fabrics for the conditions in which they are used. SAR dogs use cordura fabric for work in the rubble so as not to cut their paws on broken glass and sharp stones. Gun dogs use nylon mesh booties. Sled dogs prefer the softness of polar fleece for cushioning as well as protection for the long distance runners. Asphalt and concrete can be very hard on a dog' feet and legs, making them more susceptible to injuries.