Perhaps the cat is exercising or trying to get attention. Maybe it's part of its natural behavior or it's responding to a stimulus in its environment that makes it jump in that way.
Maybe it's excited or trying to catch something.
The reason for the cartoon dog's action could be a variety of things. It could be defending its food or toys, or simply being overly energetic and looking for something to do. Maybe it has a history of not getting along with the cat and is being aggressive.
Maybe it's having fun or playing. Sometimes cats just do random things for entertainment.
Maybe it ate too much and didn't exercise enough. That could be the reason for its weight gain.
Maybe it's popular because it shows the cat's funny and nervous expression when jumping, which makes people laugh.
Well, it could be due to a virus or maybe it got into a fight and got injured. There are several possible causes for the fat cat to fall ill in the cartoon.
The fat cat could be drawn to the donuts because they smell delicious or it just has a fascination with sweet treats. Maybe it's imagining how good they would taste.
The cartoon guy might be jumping because he won a game or just felt like having a burst of energy. Sometimes in cartoons, characters do random things for no specific reason other than to add some action and entertainment.
Maybe it's just having a joyous moment and expressing it through jumping.