Well, perhaps Harry discovers Snape's dog has bitten someone. He might initially be reluctant to get involved but his sense of justice makes him step up. He could start by finding out how severe the bite is and then look for a way to clean the wound properly to prevent infection.
Perhaps it's one of the Hogwarts students. The dog might have been provoked by the student's actions, and Snape is too embarrassed or proud to clean the bite himself, so Harry is made to do it.
In this fanfiction, perhaps the dog that bit Snape was under some dark magic influence. Harry not only cleans the physical bite but also has to figure out the source of the dark magic. He might have to search for clues in Hogwarts, and along the way, he and Snape start to understand each other better.
It could be an experienced fanfic author who has written a lot about the Harry Potter series. They might have decided to write this particular story to add a different kind of interaction between the two characters. Maybe they noticed that there are not many stories about Harry helping Snape in such a specific way.
The plot could be that Dumbledore assigns Harry to clean Snape's home as a way to build a bond between them. Harry initially resents it but as he cleans, he finds a diary that reveals Snape's unrequited love for Lily. This discovery makes Harry see Snape in a new light and he decides to try and befriend him. He starts to clean with more care, and when Snape returns, he is initially angry but then realizes Harry has a newfound respect for him.
Well, he might discover some hidden secrets while cleaning. Maybe he stumbles upon a long - forgotten spell or a mysterious object that has been lost for ages.
Well, without actually reading this specific fanfiction, it's hard to say precisely. But it could potentially be a humorous or dark exploration of the Harry Potter universe. Maybe it's a satirical piece that uses the idea of Snape's snot as a symbol of something, perhaps his disdain for Harry or some other complex emotion in a really warped way.
The plot could involve Harry, as a dog, being found as a stray in the wizarding world. He might be taken in by Hagrid, who recognizes his special magical potential. Harry could then use his dog - like instincts to discover hidden secrets in Hogwarts, like secret passages that are only accessible to small animals. He might also form an unlikely alliance with some of the other magical creatures, like the Kneazles, and together they could foil the plans of the dark wizards.
Well, it could be that in this fanfiction, Snape is written in a way that endangers Harry's friends. Harry is very protective of his friends, so if Snape is portrayed as harming them in some way, Harry would likely try to destroy whatever it is that's causing the threat. Also, it could be related to some prophecy or hidden knowledge in the fanfiction that makes Harry believe Snape has to be stopped.
Most likely not. Popular fanfictions in the Harry Potter universe tend to focus on more relatable themes like relationships, adventures, or character backstories. This 'snot' - related concept is so far from the norm that it would probably only appeal to a very niche group, if any at all.
Well, one possible plot development could be that Harry gets to experience a different kind of magical family life. The Delacours might introduce him to new magical traditions and cultures. For example, he could learn more about the Veela heritage. He may also form new relationships with Fleur's younger sister. It could also lead to new adventures as he might be involved in different wizarding events in the Delacour's social circle.