"Little Dog Lost" is an episode of Stanley. It is two parts, or otherwise considered a full-length episode. It is the holiday-themed episode.
Stanley, Lester, Marci, and Mimi find a lost puppy. Harry, mistaken by the puppy for his mother, names him "Little Dude." He helps Stanley take care of the puppy until his real owner turns up.
Of the kid quartet, Stanley is the only child who celebrates Christmas. Marci and Mimi instead celebrate the 7-night Kwanzaa. Lester, on the other hand, celebrates the 8-night Hanukkah.