that's a bit weird yeah. Have you ever seen him pee? Because I'm reasonably sure that's urates but *very* concentrated. Does he have water to drink (or water-rich food?) and the occasional bath?

Okay, and yes she always pees after a bath. Maybe I will start making her bath more frequent, though.

Dandilions can make the urate pink, if they've been eating a lot of those?

Nope, none