The dogs don't have many HP on Normal or Hard. They just have too much AC for most people to hit on a 2, so melees are really bad DPS on them. Especially the fools that never turn Power Attack off.
If they didn't get raised so often people would kill them.
VON6 I for one always kill the Claws. If they are dead, less can go wrong in the raid.
As for Into the Deep - you don't see trash at all unless you make a mistake in the final fight. Kiting is then what you do if you stuff up portal killing and you don't have a bard to fascinate it.