With decent enough gear you can do it in a few pulls. My warlocks in full S3 using 2 pieces of T5 gear (% of dmg you deal heals pet from bonus)..

In SM Cath - from the part where you open the cathedral doors.. you can send the pet in to attack mograine and clear the full room out in 1 go.. send the pet in, let all the mobs run in and then press aoe taunt... and spam SoC like a crazy person ! If you do it right, you can take them all out in 1 go... Although i messed it up a few times and ended up wiping... I did this from level 28-40ish, in about 2-3 days.