When i try to fight at the coliseum, i get a message saying that none of my pets are eligible for battle, and that i should make sure they're well fed and happy. My pet is fed, she's happy, and she's got full HP. I tried logging out & back in, but the message was the same. Anybody else experiencing this?

She may be stuck in a battle. Check this thread for some other steps: http://subeta.net/forums/view/866015

if you just adopted your pet, there is a 30 day waiting period before you can battle with it. That's a preventive measure to keep people from lending out pets for events. If not.... Check HERE and see if you pet is in a battle. If she isn't then you can make a ticket and they will help you.

Thank you so much! She was stuck in a battle, like you said. :)

Locking this as resolved :)