The Collaborative International Dictionary
shockdog
Shock \Shock\, n. [Cf. Shag.]
(Zo["o]l.) A dog with long hair or shag; -- called also shockdog.
A thick mass of bushy hair; as, a head covered with a shock of sandy hair.
Wiktionary
shockdog
n. (context obsolete English) A small dog with long shaggy hair; a shock.