One possible fanfiction could be about Ducky and Petrie going on a secret adventure. They might discover a hidden part of the valley that no one else knows about. Maybe they find a strange new type of plant or a small, friendly creature that they befriend and have to protect from the larger, scarier dinosaurs in the area.
One common theme could be loneliness. Since Petrie is a bit different from the other characters, he might be left out or feel alone, which can be a sad situation in fanfictions. Another theme could be fear. For example, he might be afraid of not being able to keep up with his friends during a dangerous journey.
One reason could be that the author lost interest. Maybe they moved on to other fandoms or just got tired of writing about Petrie. Another reason might be that they faced some real - life issues that made it impossible for them to continue, like getting too busy with work or school.
I'm not sure where to specifically find abandoned 'Land Before Time Petrie' fanfiction. You could try searching on some old - fashioned fanfiction archives or forums that might have such works stored away, but it's a bit of a long shot.
I'm not sure of specific 'Land Before Time' Petrie sad fanfictions off the top of my head. You could try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'Land Before Time Petrie sad' in their search bars and you might find some interesting ones.
A plot could be that Ducky and Petrie find a magic stone that gives them special powers. Ducky can now speak to all animals, not just dinosaurs, and Petrie can fly super fast. They use these powers to help their friends when a group of mean dinosaurs tries to take over their territory.
In a Land Before Time dragon fanfiction, the dragon could be a protector of the Great Valley. It guards against unknown threats from outside. The dragon's presence would change the way the characters interact with their environment and each other. For example, the other dinosaurs might initially be afraid of it, but then learn to trust it.
The 'Land Before Time' is about a group of young dinosaurs. Littlefoot, the main character, goes on a journey to find the Great Valley. Along the way, he meets friends like Cera, Ducky, Petrie and Spike. They face many challenges such as avoiding predators and crossing dangerous terrains. Their friendship grows stronger as they help each other through these difficulties and eventually reach the safe haven of the Great Valley.
The 'Land Before Time Novel' is mainly about the adventures of young dinosaurs in a prehistoric land. It shows their struggles for survival, like finding food and water, and also their relationships with each other.