[With the removal of their usual means for quick communication, he now has no idea where Yuuri is, as he's ended up near the entrance to the forest rather than deep underground. The Usyagi's notice about the new housing does let him know Yuuri's still around, so he's heading to their relocated house, where he finds Makkachin safe and sound, but no one else.
So you'll be able to see him running around the whole place, calling out for Yuuri with increased worry.]