i searched and didnt find.but this lets u have to pets summoned at once.
-Enslave a Infernal Bodyguard/Sentry in felwood.
-Mount up and go to jadefire run.
-Get your Infernal to auto attack a Jadefire Trickster and pray the mob casts Cause Insanity on you.
-Now this is where it gets tricky, I did it about 5 times and twice it didn't work. When enslave broke it attacked me. The other 3 times it would lose its enslave debuff and still follow me and I could control it. A tip I did is even after you've been MC'd once try and get MC'd again by the tricksters until the infernal breaks.
-Once the infernal has no enslave debuff but still follows you; log out. Upon logging back in it still follows you and attacks your target BUT does not count as a pet allowing you to summon a imp/succubus etc. This means you can EVEN get a 2nd infernal and even a 3rd or 4th! Just by repeating the same steps.
There are limitations to this:
If you get summoned/hearthstone/portal to Eastern Kingdoms (or use a boat) you lose the pet I think the same applies to instances.