One of my friends lost a dog the same way at a sled race. For some bizzar reason a porccupin appeared on the trail and many dogs were hit. We usually pull the quills ourselves but one dog was hit in the eye and sent to a local vet. It had an ellergic reaction to the anaethsetic and died. Some huskies have reactions to anaethsetics and penicillin type antibiotics. Who knows, maybe that had something to do with what happened to you.
Loosing a dog is devastating. --Kelly