When I go to the battle coliseum and click on 'Challenge an Opponent', only one of my pets shows up; Kriiten. I waited 'till Djall was done training but he still doesn't show up in the drop down menu.

Is there something I missed?

Is the pet full, happy, and at full health or is it stuck in a battle already?

Whoops; he was stuck in a battle ^-^; Thank you!