I suspect that mushers will go through an entire set of boots on the snowless stretch of trail from Rohn River to Farewell. That brings us back to Dan, whose back is arched while he holds up another husky paw for bootie installation. This is the one part of the race that I really don't like. I know it's good for the dogs and you have to do it. It's a long ways and this way you can make sure their feet stay perfect.
Some dogs are legendary for feet that can footfall on any surface and stay in good shape.
Given the right conditions of ugly ice crystals, its possible that a musher will elect to booty all the dogs even during training. I recall one winter when mushers near Nenana bootied every dog , for every training run, for the entire winter. That also included the Iditarod. The bill for booties was in the thousands of dollars. Roy Monk and the chewed up harness.