[mmiles8]

I posted this over on the July 5th notes, sorry it came after you'd done the work.

But the pets dual wielding was correctly tied to the level of the pet rather than the spell in classic. Eventually pets would be changed to always summon as the highest level, which is why more recent sites simply list a certain spell as being a "dual wield" pet.

Q: At what level will a Necromancer pet be able to dual weild?
A: Necromancer pets can often wield from Level 24 up, and reliably from Level 29 and up.

And here are more details

Q: At what level do Enchanter pets start dual wielding?
A: Enchanter pets can dual wield from Level 29 onwards.

Q: When do Magician Pets get duel wield?
A: Pets summoned after Level 20 have the ability to dual wield. This will increase the number of attacks which they can do each round.