Riley, one of my guinea pigs, is ill. Was peeing blood and squeaking in pain during the process.
Took him to the vet for a scan and it turns out he has kidney stones. Got painkillers and an anti-inflammatory for him, told to come back in 2 weeks for another scan. If he doesn't pass the stones through, surgery is needed.
Already it's getting quite expensive, but don't want to give up on him. It's a common problem for older guinea pigs.
Just my luck, though!