I’ve been watching his water intake. He is still drinking. It’s possible he is not getting enough though. I don’t know. Jude is estimated at 13, but I do think he is older. When I adopted him, they estimated age 2. He was in a hoarding situation of 30+ cats in a tiny trailer.
Merlin was much older too we think, possibly 15,we don't know how long he'd been homeless for,he just appeared. I can't offer any other advice, I wish I could, as a pawrent it's a horrible situation to be in. Jude is so fortunate to have you & be so loved. Morgana & I send you both our love.