It could be because the creator wanted to highlight something unusual or create a memorable character. Or it might be part of a story with a special meaning related to sleep or a particular trait of the girl.
It could be that the car ride is super boring and made her fall asleep and snore. Or she might have had a late night before and is catching up on sleep now.
Maybe she's just really tired and having a deep sleep. That can happen to anyone, even in a cartoon!
Maybe the dog is just really tired and needs some good rest, so it's snoring.
Maybe she's really tired and needs a good rest. That could cause her to snore.
It could be that the cartoon man has a blocked nose or is in an uncomfortable position, causing him to snore. Or perhaps he had a busy day and is now sleeping soundly and snoring as a result.
Maybe the cat is just really tired and in a deep sleep. That can cause it to snore.
Maybe she's really tired and fell into a deep sleep, that's why she's snoring.
It could be that he's in a super comfortable environment and just can't help but doze off and snore. Or perhaps he has some sleep disorder.
Maybe he's had a really tiring day and is in a deep sleep.
It could be because a snoring dog makes for an interesting and unique character. It might attract kids' attention and bring some lightheartedness to the story.