Well, it's not really ethical in the sense that Pongo is a Dalmatian and has his own breed identity. In the world of 101 Dalmatians, his character is defined by his Dalmatian-ness. But fanfiction is all about bending the rules. If the author has a good reason for making Pongo mate with other dogs, like exploring genetic diversity or creating a new kind of story, it could be acceptable. But generally, it might make some fans of the original story uncomfortable.
In the fanfic, this could cause a stir in the dog community. Other dogs in the neighborhood might react differently. If Pongo mates with a Poodle, the puppies could have curly hair along with the Dalmatian spots. It could also change the way the story progresses as the puppies grow up with their mixed - breed traits and face different challenges compared to pure - bred Dalmatians.
Let's say Pongo mates with a Husky. The fanfic could be about the puppies growing up in a colder climate. They might have the Husky's thick fur and the Dalmatian's love for running. The story could focus on their adventures in the snow. Another possibility is if Pongo mates with a Greyhound. The resulting offspring might be extremely fast runners, and the fanfic could be centered around them competing in dog races. There could also be a story where Pongo mates with a stray dog, and the fanfic could explore themes of acceptance and the challenges of integrating these new puppies into the Dalmatian family.
One possibility is that there could be some unique puppies born. Since Pongo is a Dalmatian, if he mates with other breeds, the puppies might inherit a mix of traits. For example, if he mates with a Labrador, the puppies could be large, friendly and have different coat patterns compared to pure Dalmatians. Maybe they would have the Labrador's short hair in some areas and the Dalmatian's spots in others.
One idea could be that Pongo and Perdita discover a hidden talent in one of their puppies. For example, one of the puppies has an amazing ability to find lost things. So, they start using this talent to help the neighborhood. They become local heroes as they find lost toys, keys, and even small pets. It brings a lot of joy to the community, and Pongo and Perdita are very proud parents.
In a fanfiction about Pongo and Perdita, they could have a new adventure in a different part of the city. Maybe there was a big dog show coming up. Pongo was excited because he thought it would be a great opportunity for all their puppies to show off their unique spots. Perdita was a bit more cautious. She worried about the safety of the puppies in a new and crowded environment. But Pongo convinced her. At the dog show, they met all kinds of different dogs. There were some who were a bit snooty, but Pongo and Perdita just ignored them and focused on having a good time with their puppies.
For character development, you could focus on the 102nd Dalmatian being an outcast at first. Maybe it has a different - colored spot or a unique behavior that makes the other Dalmatians hesitant to accept it. But as the story progresses, it shows great courage and loyalty, winning the others over.
A power - hungry magician in the city could be the villain. He sees the Dalmatians as having some sort of magical essence that he wants to harness for his own dark magic. Penny, with her love for the puppies, has to figure out how to stop the magician's evil plans. She might seek the help of other friendly animals in the city and use their unique abilities to combat the magician's magic.
Well, it could be a jealous neighbor dog. This dog might be envious of all the attention Pongo and Perdita are getting because of the upcoming puppies and try to cause trouble.
One possible plot could be that the Dalmatians discover a hidden talent among them, like the ability to communicate with other animals in a special way. They use this talent to save their neighborhood from a new threat, perhaps a developer who wants to destroy their park.
A third idea is to set the fanfiction in a modern-day scenario where the Dalmatians become famous on social media. The 102 Dalmatians have their own Instagram account and attract the attention of a big Hollywood producer. But there are also some jealous animals who try to sabotage their new - found fame.