The hatred shared between ChubChub and Polly is fuelled by four elements of dysfunctionality:
Awkwardness. Due to the fact that neither feline has mustered the will to break the ice, many days are filled with intense, social awkwardness when both cats spend hours on end glaring at each other from a safe distance.
Frustration. ChubChub spends her afternoon daydreaming about killing Polly and eating her. Meanwhile, she unknowingly bares the bald patches on her legs and belly which is the result of her ripping out her own fur-- a psychological manifestation triggered by her gnawing hatred for Polly.
Envy. Polly cannot understand why that bitch gets to go outside and she doesn't. Meanwhile, ChubChub wonders why God gave Polly 24 toes and not her.
Anger. ChubChub is consumed with anger because she has to share the garden with Polly, so she nonchalantly stalks her like a predator.
It is doubtful whether the hatred shared between these two felines will ever subside. Instead, it is assumed that they will be mortal enemies for the rest of eternity.