I have it bound to one of my mouse keys.
So I just do MB3+2 to start. MB3 is just milliseconds before KB key 2, since commands don't work while casting.
After you make it "obey" the first time, it will always be on "Obey" until you need to re-summon it.
I still tell it to "Obey" on every encounter, though, because otherwise it won't start attacking until after the Bio II debuff is present on the mob(which is a loss of ~3s for the pet, so 1 auto attack skill).
