They eat between 25,000 and 30,000 calories a day when racing .
The dogs are checked out at every checkpoint along the trail by vets , and dog care is of the utmost importance for everyone involved .
vets eat between 25,000 and 30,000 calories a day when racing .
The dogs are checked out at every checkpoint along the trail by vets , and dog care is of the utmost importance for everyone involved .