as fare as im concerned the dogs were bred to run, they LOVE it. many dogs are competive, they WANT to race, as in not just run but race. some people consider Flyball dangerous, its a race, the dogs want to run and the dogs want to WIN, sure the people do to, but what makes you think the dogs could care less about winning? if that were the case then Happy would just wander up to to the box rather then watch the other team and only run as fast as it takes to win. I know plenty of dogs who are highly competitive, its not a hman thing that owners just stick on there dogs. I know my dogs would LOVE to run the iditorod, my dogs getting to run that much would be a dream come true. "forcing" my dogs to run all day for 2 weeks.. oh boy they would love me forever lol they would be happy to rest for 10 minuts every 8 hours lay down pant grab a drink and start jumping up and down barking to go again. I think hat some people project what their pet dogs would think of it, the dogs that run this are ALTHLETES, they are not couch potatos that would drop dead after an hour of running.