After losing her pups, she vowed to never put another slugpup in that same feelings her pups had. So even if one followed her to the shelter, snuggled up with her, she vowed to slit it's throat so it wouldn't feel miserable.

You were a slugpup. You were freezing, yet when you saw her, feeling of hope flew through you. She threw a rock to you. Was she gesturing something? So you followed her, all the way to a shelter. She looked at you with misery, before curling over to hibernate. You, slept next to her.

You wake up to a sharp pain. That's when you see the slugcat holding a sharp rock, pointing it at your neck. She pulled it away, seeing that you had awoken.