When counting sheep does not help Ava fall asleep and the sheep complain that they are exhausted, they send in replacements, including cows, horses, penguins, and pigs, but none prove satisfactory.
- ISBN10 0802720676
- ISBN13 9780802720672
- Publish Date 14 September 2010 (first published 1 September 2010)
- Publish Status Out of Print
- Out of Print 16 June 2021
- Publish Country US
- Imprint Walker & Company
- Format Hardcover
- Pages 40
- Language English