The Jr. Iditarod is fairly self explanatory, it's a dog-mushing race for teens (14-17) who run their own teams, completely self-sufficient over a 150 mile course (we're a major checkpoint). It's a pretty cool thing.
The Susitna 100 happens a few weeks earlier,(Feb 14th this year), and it's much nuttier. It is a "human powered" race - meaning you can ski, bike, or snowshoe the race - which is 100 miles, all wilderness trails. 100 f'ing miles - completely on your own, through some absolutely frozen, desolate landscape. These people are total nut-jobs. We're the halfway point for this, and there is some serious comedy as shell-shocked bodies start rolling in.
But back to the dog lot - it's needed for the Jr. Iditarod, so that racers can rest their teams, and any injured dogs can be checked out by a vet, dropped off, flown back into town, etc. We also have a lot of adult mushers who come out for weekends to do practice runs for their teams, stay overnight, etc. I knew practically nothing about dog-mushing before I came up here - not that I know all that much now - but I am amazed at how much care these people take with their animals.