I'm not sure specifically as there could be many different plots in such a fanfiction. It might involve Harry being magically or otherwise trained to behave like a pet, perhaps with some humorous or strange situations along the way.
Well, in 'harry trained as a pet fanfiction', it could be that Harry is under a spell that makes him act like a pet. Maybe he has to follow commands like a dog or a cat. He could be in a situation where he has to learn to adapt to this new form of existence, and there might be characters who are trying to either help him break the spell or keep him in that state for their own purposes.
Harry is surely the central character in 'harry trained as a pet fanfiction'. Besides him, it could be that his friends like Ron and Hermione are also involved, either trying to rescue him from this strange situation or being part of the process that led to his being trained as a pet. There might also be a new character, perhaps a dark wizard or a quirky magical creature, who is responsible for the training.
I'm not sure specifically as there could be many different plots in such a fanfiction. It might involve the founders of Hogwarts (like Godric Gryffindor, Salazar Slytherin etc.) training Harry in magic skills, perhaps in areas that the regular Hogwarts curriculum doesn't cover fully, like advanced dueling techniques or ancient magic knowledge.
It could be about Sirius teaching Harry advanced magic skills like Patronus charm. Sirius, being a skilled wizard, might train Harry to be better at dueling and facing dark wizards.
Well, perhaps it could be about Merlin using his ancient and powerful magic to train Harry in combat skills. Maybe he teaches Harry spells that have been long forgotten.
Well, it could be that Merlin teaches Harry some ancient and powerful magic. Maybe Merlin shows Harry how to control magic in a more instinctive way, different from what he learned at Hogwarts.
Well, one possibility is that Harry would become an even more powerful wizard. Merlin could teach him ancient spells and magic that are long forgotten in the wizarding world of Harry's time. Harry might gain a deeper understanding of magic's origin and be able to use magic in ways that are more instinctive and powerful. He could also learn about different magical cultures from Merlin's vast experience.
One possibility is that Harry discovers a world where fanfiction has the power to change the real wizarding world. So he has to train to fight against the alterations caused by these fictional stories. For example, if a fanfiction made Hogwarts a place full of dangerous magical beasts that don't belong there, Harry would need to train to restore order.
Well, perhaps Harry could be trained in some long - lost or dark magic that Dumbledore has been hiding from him. This new training might make him even more powerful than before, able to defeat Voldemort in a more spectacular way.
Maybe Harry discovers some long - lost magic techniques taught by Godric. He could become super powerful and use ancient spells to fight Voldemort.
The plot could involve Harry using the trained hawk for various tasks like delivering messages secretly. Maybe the hawk helps him spy on the bad guys in Hogwarts, flying around unnoticed and reporting back to Harry.