This is SO the dynamic in the Chonga household. We bought specific beds for Bobbi McFeline and Sophie Girl, but Bobbi thinks ALL the beds in the house are hers (even Mrs. Chonga's and mine)!
Despite Sophie loving Bobbi as her sister, Bobbi can be rather (how do I put this nicely), a be-otch when it comes to Sophie! So when Bobbi is on Sophie's bed, Sophie lets sleeping CATS lie. Sophie won't sleep in Bobbi's bed because it's too small.
As for who wins this little face off between the puppy and the cat, take a watch. You think you know who'll win, but you might be surprised!