Bella has the run of the house and sometimes likes to sleep in the peace and quiet of the spare room, she has a duvet on the spare bed and can curl up and sleep for hours. Today she went into the spare room and was makng a noise, I went in to find her 'digging up' the duvet and then proceeded to squat and wee on it! When I pulled the duvet off to wash I found there was a lot of wet, fresh wee patches scattered all over the place! Whay did she do this on her own bed? She is 2 years old and was spayed a 7 months, surely this isn't a 'sexual' thing??? Help!