Earlier when I clicked to get to the page that we needed to fight the goo hund, all of my pets were there. I noticed it said I needed to get two weapons so I found one and added it. So I went through the plot click areas again and now its not showing up with choosing a pet for me to fight with him. Here is a screen shot. Its blank where it says 'Select Pet'

If any of that makes sense? Its kind of hard to explain..

http://img.photobucket.com/albums/v486/kage88370/see_zpsyndtgffb.png

You need to feed your pets, and also ensure they are happy with a minion or toy.

The battles were not checking the pet hunger level earlier. No idea why.

Ooh okay thank you! I will fix that right now xD

I have the same problem and I know for sure that one of my pets is 10/10 on food and happiness - he's in the resort right now, in fact.

Same here. The pet is 10/10 happy and fed yet I can't use her to battle...

Health. I just remembered health was a thing...

She was at max health, I just discovered my pet was still in a battle that I forgot about. My internet was being screwy the other night.