The Sheep and the Cow

From Muppet Wiki

The Sheep and the Cow are two mischievous animals featured in the Mother Goose Stories episode "Boy Blue". The Squire hired Little Boy Blue to watch over the pair, keeping the sheep out of the meadow and the cow out of the corn.

Although they would deny any interest in the meadow and corn (citing allergies to the meadow grass and the corn), the two would take any chance to sneak into these forbidden areas. Boy Blue would watch the pair each day and blow his horn if they misbehaved.

One day, Boy Blue fell asleep on the job; the duo quickly took to the meadow and the field to eat the Squire's crop.