I'd advise at least 1-2 of the pets be a bird with screech when it becomes available (Greater Fleshripper (16-17, Westfall) * Screech 1). That'll help control groups. Another cool pet might be a gorilla at level 30 for aoe damage, or a dragonhawk (level 5+) from eversong woods.

If you have one pet doing growl, and another doing aoe, it leaves the rest to just use focus dumps like claw.