It's D.W.'s birthday and all she wants is Mary Moo Cow (purple with pink spots--not pink with purple spots!) But when Mary Moo Cow gets sick to her stomachs (cows have four, you know), D.W. thinks her party is ruined. But Arthur saves the day when he arrives--disguised as Mary Moo Cow!
- ISBN10 0986216860
- ISBN13 9780986216862
- Publish Date 6 December 2016 (first published 7 February 2008)
- Publish Status Active
- Imprint Marc Brown Studios
- Format Paperback (US Trade)
- Pages 26
- Language English