Cur A fawning, mean-spirited fellow, a crop-tailed dog (Latin, curtus, crop-tailed. French, court; our
curt). According to forest laws, a man who had no right to the privilege of the chase was obliged to cut
off the tail of his dog. Hence, a degenerate dog or man is called a cur.

I have also read that nobles had peasants' dogs' toenails cut off so that they could not chase deer.