I'm one opponent away from beating the opponents, but it keeps telling me I can't with the pet I've been using, for some reason.

It's Katie, and she's got full health, she's bloated, and very happy. I'm not understanding why it's not letting me?

Is she still in an unfinished battle? Try checking the statistics page.

ahhh that's it! thank you!

No problem :) Nice nightmare lain!