Eren looks no more dopey than a real wolf or dog, and since that's an expected thing, it doesn't strike Levi as odd at all. If anything, it's a good thing, to see him enjoying himself, even as a mutt. Maybe that's the benefit of being able to change into an animal, to let go of too much thought and just rely on instinct.

Levi tracks Eren to where he's found the last box, exactly where he'd buried it, and maybe even cracks the faintest of pleased smiles. It's more in his eyes than anything, but he gives Eren another encouraging ruffle, shows him the stopwatch, paused with three seconds remaining.

"well done, Eren."

He retrieves the box, and inside is indeed Erwin's sock.

"Sorry, didn't bring you any mutt treats," he says as they make their way back to the clearing. "You'll have to be satisfied with some cookies Erwin made, later."