Here are my pets stats, yet the coliseum says he's not eligible for battle.

Hunger 10 /10 Happiness 10 / 10 Likes 0 Level: 139 Health: 123 / 123 Strength: 157 Defense: 110 Speed: 95 Intelligence: 259

Tier: 2 Rank: 14,344

Have you checked your stats page to see if your pet is still in a battle?

Yeah, turns out I was in one...I didn't know how to get to a page to see if I was still in battle. I bookmarked the page but it'd be really nice if they'd make features like that more accessible. I always end up feeling stupid for asking for help after I've looked for 20 minutes trying to figure out what the problem is. OTL

EDIT: Forfeited and still not eligible....

@ Quo It's actually listed in the links right at the top of most pages in the BC. If you look on the main challenge page for instance, it's up there with the links to the armory, to spend exp, and so on. It's just labeled Statistics.

RE your edit: you might have to give it a minute. The cache gets a little funny sometimes.

It's still saying he's not eligible u.u

If it's Wiz Khalifa, it's because his health is at 0/123. A quick visit to the Healer can fix him right up.