Maybe it's just a random thing the creator came up with for fun.
It could be part of a comical scene or to draw attention in a unique way. Or perhaps there's a hidden meaning that's not obvious at first glance.
It could be that in the cartoon's storyline, the word 'balls' is a trigger for some kind of action or reaction for the dog. Maybe it's part of a game or a funny situation.
It could be that there was some sort of chase or adventure in the cartoon that led to the dog losing its balls. Or perhaps it was just an accident.
The dog loosing balls in the cartoon could be to show its playful and energetic nature. It could also be a plot device to lead to other events or interactions with other characters.
It could be that he's trying to get someone's attention or express his frustration. Sometimes, characters in cartoons yell for all sorts of reasons related to the plot or to create drama.
The woman might be yelling at the man because he broke a promise or did something that was unexpected and upsetting. Cartoons often use such scenes to create drama and entertainment.
It could be that the mom is having a bad day and is taking it out on the kid. Or perhaps the kid didn't follow the rules and the mom is trying to teach a lesson.
Maybe it's just having some fun or following a specific plotline in the manga.
It could be that the old man is expressing anger at some injustice or unfair situation he perceives. Or perhaps he's lost his mind and is just acting out randomly.
Well, in cartoons, sometimes such actions are shown for comical or attention-grabbing purposes. It doesn't necessarily have a deep meaning, just a way to create a humorous moment.
Maybe he yells to intimidate villains or show his determination.