My cockepoo has been sitting on the floor rubbing her bum like they do when they have a dirty bum . But her bum is clean and no sign of external soreness . I Took her to the vet yesterday who stuck his finger up and pronounced nothing wrong and offered no explanation for why she might be doing this . I've got her booked into groomer next week for a haircut in case she's just hot - has anyone else come across this before? She's doing it a lot - and usually hardly ever does it so definitely out of character for her .