for Barnyard Fun by Maureen Wright and Paul Ratz de Tagyos
When Sheep found out it was April One, he said, "It's time to have some fun!" Sheep set the alarm an hour ahead. It woke up Rooster in his bed.
Sheep plays April Fool's jokes on Rooster, Dog, Pig, and Cow. Then Horse decides to play a trick on Sheep--and the farm animals have the biggest laugh of all!