There are several artists going by the name of Dirty Dog:  http://dirtydogband.com
Dirty Dog was a romanian classic/blues rock band. Band members Rares Branzoi (drums), Vlad Dumitrescu (guitar/vocals) and Paul Dragusin (bass/keyboards/vocals) got together in august 2010 for some jam sessions that turned out surprisingly well. The group decided on the name Dirty Dog soon after.
The band had their first gigs the following month. They are currently working on their first album and are planning a series of gigs soon.