Fact of the day:
when leveling up further levels of Feral Impulse (ie levels 2, 3, and 4) the damage is actually increased BEYOND the normal damage increase for a few seconds, then the damage aura is rescaled to the correct damage.
for instance at level 3, with no items, you should have temporarily +21 bonus damage and your wolves +7 bonus damage for like 2 seconds before the game readjusts the values to +12/+4. I abuse this fact quite a bit when jungling
also, when you are invisible and your wolves or other units (such as Necro warriors) are within your Feral aura AOE, the IAS portion of the aura will be disabled for your non-hero units.