You do not have nearly enough focus in classic to use all the moves, learn the highest rank Screech and Growl and use them, Screech provides 20ish percent physical damage reduction and minimal aoe threat, so if one of your pet dies another can pick up aggro without running to your hunters.

Demo shout bug that affected warriors also affected Screech, so after the nerf it is really hard to hold aggro while multishoting, before that you just sent your owl into 4 man dungeon packs and held threat