Bah, something is buggy and I'm not allowed to reply on the forum. (OH, derp. It's the EU forum...)
My initial reaction to changing scorpids was negative, but thinking about it, I'd be happy giving them a poison stun and moving the disarm to crabs. Which would mean getting a crab again....sigh, first world hunter problems.
Anyway, that leaves dogs and devilsaurs.
I'd give warp stalkers the windfury buff and give their slow to dogs. If that's too many families with the windfury buff, then hyenas could go back to a physical damage debuff.
Devilsaurs would be excellent with the reduced ap debuff - or perhaps a reduced sp debuff! Give them something unique....and really, what caster wouldn't wet their pants at a devilsaur being on top of them?

Kind of situational, though. Go with ap.