Oh, yeah, she's my pet. Yuj found her and brought her home.
- Mog Trivia
Snow is a stray cat that Yuj found, kupo! Gadot was just joking when he said they should call her Snow, but the name stuck and that was that.
But in fact, everyone in the town has their own name for her, such as Esmeralda and Mewmew. It's one thing to call a girl cat 'Snow,' but when you give her a dog name like Spot, that's just wrong, kupo!
—Sparkling Runestone fragment.
One day Yuj found a stray cat and brought it to NORA House. There he asked if they could keep her and heard no objections. The cat then approached Serah making her smile.
After finally catching her, Serah tells Noel Snow's backstory and reflects the loss of her sister, Lightning, and her fiancee, Snow Villiers, "how [NORA] saw right through her", and how they keep together to keep strong in tough times. Then Noel asks her if she considers them a family, and the player is given various reply propositions. If the player chooses "The cat is my only family!", Serah will remark her affection towards the cat.
Snow is named after Serah's fiancée, Snow Villiers. This name was specifically chosen by NORA to fill the emptiness within Serah's heart after his departure to search for Lightning.
- Possibly due to being named after Serah's fiancée, in at least one cutscene in Final Fantasy XIII-2, Snow is referred as a male.