Help

[Arabella]

Sometimes simple changes can cause a cat to pee in weird places such as changing the location of the litterbox. Star was used to the litter box being in a particular corner and we rearranged the room but she continued to go in that corner regardless, then she got used to going outside so she become potty trained to going outside. Sometimes stress, like the holidays too. Like the previous poster said, I'd call the vet to rule out a UTI too.

[catmandu]

the only timme My Found Cats ever made a mess was when they were very ill or Tubster Panther had to get used to going to a box.
I would put that box back and see if that helps.

[Medusa]

Definitely a vet visit is in order. Unfortunately, inappropriate urination is one of the ways our furkids tell us that something is wrong. After illness is either ruled out or attended to, then follow the advice on the link that krazyaboutkatz posted. And definitely use Urine Gone (my cleaner of choice) or another enzyme cleaner to get rid of the urine odor on your mattress or it'll happen again and quickly, too. Good luck. I know how frustrating this can be.