pets and weapons

[Vladesch]

I was wondering if there are level restrictions on what charmed mobs can dual wield. IIRC it's a necro level 24 pet that is the first that can duel wield weapons you give him, so maybe the same principle holds for charmed pets?
I ask because I've been charming grimalkins in LOIO, and I suspect that it's not doing any more damage after I give it 2 daggers. The damage seems rather poor. Even when charm breaks and it hits me, it's pretty poor damage for supposedly dual wielding.