Growley

DESCRIPTION

Dean: You're back?
Crowley: I'm invested. [Hellhound growls] Stay!
Dean: You can control them?!
Crowley: Not that one. [pats his Hellhound which appears to be about 5 feet high] I brought my own. Mine's bigger. Sic 'em boy!

– Crowley and Dean, 5.20 The Devil You Know

When demons send hellhounds after the demon Brady in 5.20 The Devil You Know, Crowley appears with his own hellhound, which fights the other hounds while Sam, Dean, Crowley and Brady make their escape.

Crowley later summons the hound when Bobby has trapped the demon in a devil's trap in an attempt break the deal for Bobby's soul in 6.04 Weekend at Bobby's. When the hound appears Crowley offers his own deal: "Ten years of living, or ten years as Alpo."

Although its origin is unclear, the hound has been called Growley in fanfic, and the name was also mentioned by a fan to Mark Sheppard at Asylum 6 2011 (Source).

Growley is also sometimes used as the mash-up pairing name for fanworks featuring a Slash relationship between Crowley and Gabriel.