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. Dogs who train on these surfaces also use the polar fleece booties.
Booties can help prevent the dogs from cutting their pads on the ice crystals and rocks.
They help keep the salt out of cuts and scrapes. If the temperatures are warm enough, the polar fleece gets soaked pretty quickly in the slush, and you may want to use the waterproof cordura during these times. There are other good varieties of booties. Some are made of waterproof heavy cordura nylon, have a soft polar fleece lining, and secure with Velcro. Although a little expensive, these are especially nice, are much neater than smearing waxes or creams on paws, and they protect paws from broken glass on the roads.