Have to do 1 pt of damage for pet to not steal all the exp?

[unsunghero]

I already knew about the needing to do more than 50% of mob's health to avoid the pet taking 50% exp

However, I was under the impression you could still get some exp even if the pet did 100% of the damage

Is this true? Because it seemed like I was not getting ANY exp until I started using a level 1 spell to deal at least 1 point of damage. Is this all in my head or do you need to do at least 1 point of damage to avoid the pet taking 100% exp?