Childrens Book: A fly flies into a room full of pets - room gets cleaned

I'm looking for the exact title of a short childrens book. A kid has to clean his room. A fly flies in; it gets chased by the dog, the cat, disturbs the hamster (?), the budgie, etc., and by the book's end, all the disaray is cleaned up!

Easy! Because I read this not long ago, funny story!
When the fly flew in... Lisa Westberg Peters

I KNEW it would be easy, thanks Bookel, that's it!