Only today I have noticed that my active pet can't be involved in battle. I can't choose my pet on the page of challenging opponent. Its name doesn't even appear in list of available pets, although pet is not hungry and bored. Have no idea what's the matter :C

Have you checked your statistics page to see if he's stuck in a battle?

Thank you! That was it. I didn't battle for so long time, that forgot about that lol