what causes this??

what causes Icis to pee outside her litterbox when in heat? other times, she is perfectly fine to use the box. when she is in heat, or close to it, she likes to find my clothes hamper and pee on MY things, not my husbands!!!, drives me MAD . also, its seems that Icis goes into a heat every 3 weeks, and hers last 5 days, compared to Prue, whose only happen ever 5-6 weeks, and hers seem to last 24-48 hours. Prue dosent scream all day, or rub everything in reach either , as icis does.


i am trying to get them both spayed ( crossing fingers it will be within the next 8 weeks )

A desire to mark her territory so that males know (by smell) that she's there and willing. I hope you can get her spayed soon.