The Hound of Xoriat has been completed by Tethtoril and Kitsings.
We failed our first attempt, succeeded our second.
We had Tethoril run in the middle to get the aggro of the big dog and go get the 4 stones, clear the renders and then charm the dogs. While I was singing the bard song for the dogs, Teth kept the dogs up with cure serious wand/spell/ lay on hands. I took over heals after bard song and was pretty much smooth sailing from there.