We have a female cat around 3 years old (rescue so not exactly sure of her age). She has a litter tray but comes and goes in and out of the house and most of the time she doesn't use her tray. Around a week ago, she came in from outside and used her tray and we saw some blood. We couldn't be sure where it had come from so decided to monitor for a couple of days and call the vet if it happened again. It hasn't happened again until tonight.
I noticed tonight that the newspaper around her tray was damp and the floor was a bit sticky so I cleaned it all out while she was outside watching me from the garden. Once I finished, she came in and went straight to her tray and there was blood again, although not much pee. I will call the vet tomorrow and have her seen but just wondered if anyone else had experience of this and could offer any advice? A quick Google suggests it could be a urinary tract infection but could also be something much more serious.