The star of the classic knock-knock joke meets other beloved characters like a road-crossing chicken, an old dog, and a wolf in sheep's clothing--and even befriends a zebra and a duck who's a real wise quacker!

This laugh-out-loud paperback boxed set includes:
Interrupting Cow
Interrupting Cow and the Chicken Crossing the Road
New Tricks for the Old Dog
Interrupting Cow and the Horse of a Different Color
Interrupting Cow and the Wolf in Sheep's Clothing
Interrupting Cow Meets the Wise Quacker