It is a dog in the Iditarod who is "dropped" because he cant go on because he is sick, injured, ect.
It means to drop a musher dog off at a checkpoint. From the on it is cared for by vets then flown back to the start were the musher then picks up the dog after he/she finishes the race.
Follow the related link, below, for some very good information on the race.
Iditarod Trail Sled Dog Race was created in 1973.
Alaska's Iditarod Trail Sled Dog Race ends at Nome.
Dorothy Page is known as the "mother of the Iditarod trail sled dog race."
The Iditarod dog sled race starts in Willow, Alaska.
Alaskan dog sled race
A tired or injured dog carried in the sled
the first jr. iditarod sled dog race was in 1978
The Iditarod dogsled race begins and ends in Alaska USA
The dog sled race name, Iditarod, means '' clear water''
First iditarod was made to deliver mails on the sled which is pulled by the dog.Now they use it for sled dog race
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The Iditarod Dog Sled Race.