There are bad people in every industry. There are shitty people everywhere. It would be insane to pretend there magically aren't any in this sport. But the majority are people who love dogs and who love the preservation of the breeds and the culture around dogsledding.

I know more than a couple of distance mushers and they are dog-care-above-all people.

Most of the huskies who run are Alaskan huskies, a mutt "breed" consisting largely of northern breeds and hounds, yes. But considering that they're shooting for dogs whose natural biology lends itself to thriving in extreme cold, it's not really greyhounds but more likely hounds with hardier coats and more muscular builds.

There aren't many identifiable breeds in Alaskan huskies at this point, since that lineage is so far removed from what they are now

Ohhh poor thing! And poor you!! But the fact that he was patient enough to allow your help means he's probably not going to hold it against you in the future. You live and you learn; you will both be ok!