Pets and morale boost

I was doing some Tyrian mission bonuses last night and decided to take my pet Fritz with me. Haven't had him out for a stroll lately. One thing I noticed:

I, and all my heroes, had a 10% morale boost, but Fritz just had a 4% morale boost. Killed two more bosses and his morale boost stayed at 4%. He did not die at all.

Does anyone know how morale boosts work with pets? Is there some formula that causes them to have less?

Thanks~

Seems like no one know the answer to this. I'm out again with my pet this morning, and from what I am observing, pets don't get morale boost from killing bosses, but do get a morale boost in missions when you accomplish something (like, knocking out a siege engine) and the entire party receives morale boost.

Can anyone confirm this?

Yup, happens. Morale boost in mission from auto events gives it to everyone, so pets get it, but just killing bosses is party only