Here is a truly horrific story published by The Vancouver Sun about 100+ sled dogs that were brutally murdered (shot and throats slit by an inept and incompetent employee that believed he was "euthanizing" the dogs) last year by an employee of Howling Dog Tours of Whistler (British Columbia, Canada), owned partly by Outdoor Adventures.
It appears that the dogs were massacred because business was poor, and the dogs were deemed unadoptable because they are bred and raised for sport and recreation (and not as pets). Such similarities to racing greyhounds' plight.
Unfortunately, I don't know whom to contact to demand an investigation into and revision of rules and policies in the sled dog industry. If you do, please leave a comment here -- it would be much appreciated.