I've got a problem that has been escalating now that winter is here. I have a 1 1/2 yr old female cat that is the sweetest, most well behaved animal you could imagine. However, she has started peeing when she gets angry about something. She first had sprayed the shower curtain when my other cat attacked her. Now with winter here we do not let her out, so she has started peeing at the door if we refuse to open it. She still uses her litter box and we have checked with the vet about a UTI, but that is not it either. Is there any way to keep her happier? If my stepfather finds her one day, he will kick her outside for good.