My goldfish seems to be doing better. I will now pronounce him cured.
This morning I got a bunch of shy cats to get out of their beds and have a cuddle and walkabout. Two girl cats were in a cage with a bed only big enough for one, so the more stressed cat was sitting in the litter box. I got them a bigger bed and they became much more relaxed and amiable as they cuddled together. The guy who was in before me referred to the cats as "dicks" for being so scared they were hissing and refusing to leave their beds. Being able to pat them felt like an accomplishment.
12 hours ago