This is a really informative and disturbing piece by Christie Keith on the San Francisco Chronicle online (whole piece at link) from last month which outlines the brutal slaying of over 100 healthy sled dogs in Canada.
Because of slow business, dog handler Robert Fawcett was instructed by his employer to get rid of excess dogs that they couldn't support. The company is Outdoor Adventures Whistler. After a vet refused to put the healthy dogs to sleep Robert decided to kill them using a gun and a knife. This is a man who claims:
He had named them. He'd raised them. He was responsible for feeding them, caring for them, and handling them. He lived with them, and was available to tend to them seven days a week. He had developed, he said, "a relationship of mutual love and trust" with them.