My pet has a minion but her happiness is nearly gone, what is going on?

Is the minion supposed to be an infinite toy for the pet? I didn't know that. Most of the time I have a minion on my active pet (Ferinsy) and I always see his happiness low...

All of my pets with minions and not in the resort have empty happiness too. I'm sure this isn't normal. Even my Gourmand has always had full happiness, and it's been a looong time since I put him in the resort.

Well I'm sure they are busy with all the other stuff but at least I'm not the only one.

I'm still having this issue, what about you two?