What i did when i was leveling up my shamans was start off with a lb volley, immediately drop stoneclaw totems, kill the houndmaster making sure not to cl, then finish off the dogs. Don't underestimate the usefulness of stoneclaw totems, i still use them all the time in heroics, they will give you about 5-10 seconds of uninterrupted dps, should be enough time to down him.