It simply couldve rubbed when it skidded off the road hard enough to pull the hair(or grind it off at the base on the pavement) but not rip all the way through the hide itself, just taking off a light layer. I dont see why its not at least possible. Ive had it happen to deer ive taken, occassionally on long drags over rough ground. Add the dislocated leg joint,(which i didnt know about originally) and id say its very likely. Id say the offending culprit is most likey a ford F-150.

Probably the same with the one id seen, it just got raked a little harder and ripped the hide and all.