I usually run with my wolf, but I have a lion I use for pvp. The lion has prowl, dash, bite and claw trained for maximum damage. Didn't bother to train it with growl; I wanted the other four active talents.
But now, reading opinions that in Heroics and Raids the pet is there purely for damage, I wonder if I should take my lion on those runs. He would not have growl, but it is usually turned off on my wolf anyway. Even if a growl or two would be sufficient to pull a mob off of a squishy, are the relatively rare cases where that is necessary enough to sacrifice the extra damage my lion could do all the time?