Thank you so much, everyone.
Pets mum, I had plenty of treats for him, but he didn't want any.
Yesterday was not a good day for them... In the morning Casper didn't want to eat, and Sophie ate a lot less than usual, too. In the afternoon Casper perked up a bit and by the time the vet checked him over he was fine and was eating hay in the carrier. When he got home he ate reasonably well. That keeps happening, that he doesn't want to eat in the morning, but later in the day gets back to his usual self. I don't know why... The vet said it could be stress, the Baycox, or the coccicdiosis, or a combination of those. This morning most of their veggies from last night are still there, and their Urinary Health sticks, and Casper doesn't want to eat again, and Sophie's not her usual hungry self, either.