I'm not sure specifically what this 'poor little cat sad story' is about without more details. It could be about a cat that got lost, was abandoned, or faced some sort of illness or hardship.
The end of the 'poor little cat sad story' is hard to say. If the story is about a sick cat, perhaps it received medical treatment and recovered, and found a new loving home. But if it was a story of a cat facing a lot of danger, like being in a place full of predators, it might have ended with the cat losing its life. There are so many possibilities depending on what the initial situation in the story was.
Once there was a little dog. It was abandoned by its owner. It wandered the cold streets alone, looking for food in the garbage. Its fur was dirty and matted, and it had a sad look in its eyes. Every day was a struggle for survival, with no one to love or care for it. It was a truly poor sad story of an innocent creature left to fend for itself.
Once there was a cat named Whiskers. Whiskers used to have a loving family, but then they moved away and left him behind. He was left all alone in an empty house, meowing pitifully, waiting for his family to come back. He had no food or water, and his fur started to look dull. Every day, he sat by the window, hoping to see his family again, but they never returned.
There was a poor family living in a dilapidated shack at the edge of the town. The family's main breadwinner, the father, passed away suddenly. The mother, who had no formal education, found it extremely difficult to find work. The family's only source of income became the meager amount they got from selling the few vegetables they could grow in their small garden. Their eldest son had to drop out of school to help support the family, and they often went to bed hungry. Their story was one of constant despair and sadness.
Ugly the cat's story is truly a sad one. Ugly was a stray cat. He was often overlooked by people passing by because he wasn't as appealing as other cats. He tried to find a home but was always rejected. He had a hard time finding food too. One time, he found a little bit of food near a dumpster but was chased away by a bigger and stronger cat. He was so sad that he couldn't even meow properly. He just sat there, looking at the world with his sad eyes, feeling like he didn't belong anywhere.
Once there was a cat named Whiskers. He lived in an old, dilapidated house with his owner who was very ill. His owner could no longer take proper care of him. Whiskers was often hungry and lonely. One day, his owner passed away, and Whiskers was left all alone in the cold, empty house. He meowed sadly, but no one came to his aid. Eventually, he wandered out into the streets, scared and confused, facing an uncertain future.
Well, if we think about it, perhaps 'Sad Lisa' is a fictional character who is a big fan of Cat Stevens. His music might have influenced her in some way, either making her feel better in her sad times or maybe even deepening her sadness. It could also be a story where Cat Stevens' song lyrics seem to tell the story of Sad Lisa, as his lyrics are often very narrative.