i dont know you a hole
if you don't have an real answer then don't answer at all. What happens at a Iditarod checkpoint is:
Every single checkpoint that the race goes through has a team of vets available and ready to evaluate and treat injured dogs. The vets partners with the mushers to go over every team when they enter a checkpoint, evaluating individual dogs and answering any questions the musher may have. Likewise a musher can "drop" a tired or injured dog at any checkpoint, meaning they sign the dog over to the Iditarod vets and volunteers to care for and transport the dog back to Anchorage.
Dogs, especially any injured dogs, are top transport priorities, and bump everything else...including humans. The "Iditarod Air Force" a highly skilled team of the cream of the Alaskan bush pilots, will make priority transports of injured dogs from the checkpoints anywhere along the race back to Anchorage and advanced medical care if needed. Most dogs simply need rest, and are transported back to Anchorage and picked up by the musher's designated local contact person. If more treatment is required, the dogs are taken directly to advanced veterinary clinics to have that performed.
The health and safety of the dogs is the top priority for the mushers as well as the vets and trail volunteers. After all, the musher can't travel without them. I know someone who dropped 2 dogs in Ruby, a little over half-way through the race, because of sore shoulders -- it was in their best interest, even though they still wanted to go. By the time they got to Anchorage and their handler picked them up back there, they were bouncing around looking for the party...they're gotten enough rest to heal, which is the one thing he couldn't give them enough of on the trail.
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The stops, including Anchorage and Nome, are:
For the southern route in odd years:Anchorage, Willow, Yentna, Skwentha, Finger Lake, Rainy Pass,Rohn, Nikolai, McGrath, Takotna, Ophir, Iditarod, Shageluk, Anvik, Grayling, Eagle Island, Kaltag, Unalakleet, Shaktoolik, Koyuk, Elim, Golovin, White Mountain, Safety, and Nome.
For the northern route in even years:Anchorage, Willow, Yentna, Skwentha, Finger Lake, Rainy Pass,Rohn, Nikolai, McGrath, Takotna, Ophir, Cripple, Ruby, Galena, Nulato, Kaltag, Unalakleet, Shaktoolik, Koyuk, Elim, Golovin, White Mountain, Safety, and Nome.