From The Collaborative International Dictionary of English v.0.48:
Cur \Cur\ (k[^u]r), n. [OE. curre, kur; cf. dial. Sw. kurre dog, OD. korre watchdog, and Icel. kurra to murmur, grumble, Sw. kurra to rumble, croak, Dan. kurre to coo, whirr; prob. of imitative origin.] 1. A mongrel or inferior dog. [1913 Webster]
They . . . like to village curs, Bark when their fellows do. -- Shak. [1913 Webster]
2. A worthless, snarling fellow; -- used in contempt. [1913 Webster]
What would you have, you curs, That like nor peace nor war? --Shak. [1913 Webster]