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Paradoxic
(Experienced, Not Yet Jaded)

It's a book for somewhat older kids, part of a series about a kitten who ends up adopted by a girl. The book in question might've been a Christmas special (or not), with the kitten in question somehow getting out of the house during winter, and finding another even smaller kitten in an abandoned house. She takes care of the smaller kitten - I vaguely recall something about finding a ham sandwich and ripping bits of ham out for the smaller kitten, as well as making a nest out of discarded rags and huddling with the smaller kitten for warmth. Her humans end up finding her, and adopt the smaller kitten as well.
Edited by Paradoxic