Winter
From Serenity : The Wiki
The Rescue
As a small kitty, Winter lived out on the streets where he was born. Surviving on his own as an alley cat, he enjoyed sleeping inside of garbage cans because he found the scent of rotting fish and garbage soothing. One day, his napping was so rudely interrupted by a young Autumn as she walked past his garbage can. After Winter gave a slight meow, he hopped from the garbage can and began following her in hopes of food being handed out. Eventually, the woman made her way to yet another woman near the spaceport. The two took him back to their hotel, cleaned him and fed him.
He is now owned by Dr. Zoey Calihan.