Perhaps the jackal was rescued by Harry during one of his trips to a magical forest. It was injured and Harry nursed it back to health, and from then on, it became his loyal pet. In fanfiction, this would show Harry's kind heart and his connection to all living things, magical or not.
In some Harry Potter fanfictions, Voldemort's pet could be a large and menacing snake, like Nagini. Since snakes are often associated with Slytherin and Voldemort was a descendant of Slytherin, it makes sense for his pet to be a snake. It could also be some sort of dark magical creature, perhaps a basilisk under his control. Another possibility is a magical raven or crow, which could be used as spies for him, flying around Hogwarts and other places to gather information.
In fanfiction, Harry Potter could have a phoenix as a pet. A phoenix is a very magical and majestic creature. It can be a great companion for Harry. It has the ability to heal itself by bursting into flames and being reborn from the ashes, which could be useful in many dangerous situations Harry might face.
Well, it might be a dark magical creature that is not from the normal wizarding world. For example, a shadowy beast that can move through walls and is almost invisible. This pet could be used by Voldemort to terrify his enemies and deliver secret messages.
It could be from a long - lost ancestor. Maybe one of his great - great - grandparents was a powerful fire wizard and the gene has been dormant until now.
There could be a 'Harry Potter Jackal Fanfiction' where the Jackal is a guardian of an ancient magic in Hogwarts. The story could explore how the Jackal has been hidden away for centuries, and then Harry and his friends discover it by accident. The Jackal then becomes an important part of their journey to uncover more about Hogwarts' secrets and defeat the dark forces.
It could be a snowy owl, just like Hedwig. In the original series, Hedwig was Harry's loyal and beautiful owl. A fanfiction might follow this idea and have Harry find a young snowy owl that he bonds with immediately.
Well, it could be about a character who is forced to hide their true identity and pretends to be a pet in the wizarding world. Maybe they are on the run from some dark wizards and find a safe haven by disguising as a pet in a Hogwarts dormitory.
Perhaps the hellhound has a special power like being able to travel through fire unharmed. This power could play a crucial role in the story. For example, the main character and their friends get trapped in a burning building, and the hellhound uses its power to create a path through the fire, allowing them to escape. The fanfiction could then focus on how they keep this power a secret from the school authorities.
One possible plot could be that a new, mysterious pet appears in the pet shop in Diagon Alley. This pet has some unique magical abilities that no one has ever seen before. A young witch or wizard discovers it and tries to figure out its origin and how to take care of it. Maybe it's a key to an ancient magic mystery.
Well, perhaps in the fanfiction, Harry's unusual pet was a gift from a mysterious wizard who had been observing him. This pet could have the power to turn invisible at will, which would be really useful for Harry during his adventures at Hogwarts. It might be a small, furry creature with big, intelligent eyes that could communicate with Harry in a special way.