Finally

It was a hot day, so the best day to try to get Caspar in the water.
At first the fountains around this "bath" were to powerful and high, but turning the water pressure down, going through the water ourselves and teasing him with toys and treats, that all helped to get him with four paws at once in the bath.
Actually, he didn't even really mind that I gave him a shower of fine spray cloud.

The extra is a picture of the moon later the evening. At the bottom the crater Tycho and a bit left of the middle is the crater Copernicus. Both look like white spots.