For the cat's pee to stink?? Nemo is having tiny accidents, (I think he is dribbling urine all over the house, not his fault) and I can't see any puddles anyway, but I can smell it, and its very very strong, Nemo doesn't use a litter tray normally, he is trained to go outside, but we were told to put one down for him. I guess I will be bleaching everywhere again today.