Optimus the cat clearly hasn't heard the adage "Dogs rule and cats drool." In this video, Optimus has no interest in sharing a tennis ball with its canine companion, Arya. And we're guessing that scenario is nothing new in this particular household. Arya shoots the off-frame human a side eye and flatten ears as if to say, "We both know how this is going to end. We've been here before. Why are you encouraging me to get this ball from Optimus? ... But I really want the ball."
We rather doubt that poor Arya ever got her ball.