I thought I was keeping my battle pet happy by having a minion attached to him, but all of a sudden he is 0/10 for happiness! Did something change? Is this maybe halloween related?

It's a glitch. I'm not sure if it's been reported but there have been several threads here asking about it.

- Thanks! I searched around, but didn't see anyone else complaining. wanders off to report it

the Resort and Inn will both solve the unhappy pets until they fix this. I've also been doing Major Drills because he will ask you to play with your pet.

I was just about to post about this. It's annoying because I want to battle, but my battle and my gourmand pet are the same, so I can't just throw him in the resort. Ugh. Hope they fix this soon. For now, I will just buy cheap toys.

same problem...

I've been stashing my Morostide treats in a separate shop that normally doesn't sell food. When the event is over or I just can't beat the strongest challengers and I don't need to fight I will sort it by food and stuff my eaterpet silly.

Yeah I just noticed this since I wanted to battle some of the Morostide challengers. Hope this is fixed soon!

Be very careful what toy you buy to play with your pet! i played with mine and changed him into a 'magical' robot thing from a storm archan last night. I was so busy i didnt check each item and clicked 'use on' instead of 'play with'.