The Sneezing Weasel (1938)

Mama hen takes her chicks out to breakfast, but little Wilbur can't get any worms. Finally, a big worm escapes, and he runs after it; meanwhile, the rest of the family has gone inside to escape a thunderstorm. Mama realizes Wilbur's missing and goes after him, just before the weasel (hidden behind a tree) gets him.