Well, a cartoon of dog heaven could portray dogs running freely, without any pain or sadness. There could be fluffy clouds and shiny stars, making it a magical place for them.
Maybe it's for a funny and creative twist. It could be to catch people's attention and make them laugh.
It might show a sad or lonely dog, unable to move freely because of the chain. Maybe the dog house looks old and worn.
It could be a place imagined where cartoon dogs have a peaceful and happy existence, free from any troubles.
It might show the dog having a peaceful and happy life in a magical and beautiful place.
Maybe the story shows how the cartoon dog adjusts to the new and magical environment of heaven, meets other creatures, and discovers its purpose there. It might have elements of friendship and self-discovery.
I don't think there is. But you could try searching on specialized cartoon platforms or asking in related forums to see if anyone knows about it.
Maybe it's because it fulfilled its mission on earth and was called to a peaceful place in heaven.
Maybe it's for a unique artistic style or to create a mysterious look.
Maybe it's for a unique or creepy style. Some artists do that to make the dog look mysterious or different.
It could be that the artist wanted to show the dog in a different and unusual way. Or perhaps it's part of a story where losing teeth is significant for the character.