The Horror!
We strongly suspect that this dog isn’t genuinely frightened for the well-being of his plush toy companion undergoing cleaning in the laundry machine. However, let’s just entertain the idea that this is the scenario for a moment.
Toby is petrified, thinking his closest companion is stuck. He continuously circles around, appearing as if he’s engulfed in a vortex of water and bubbles. This accounts for the expression of pure terror on his face.