I was too afraid of losing Stumpy down the drain and so did not put him into the full-sized bathtub. I used his little tub, this time filling it with very warm water. He seemed to like this a little more than his previous baths, so I apparently didn’t have the temperature right. He lasted a good 10 minutes before the thrashing began, at which time I took him out and dried him off.
He looked so good that we took a selfie.