A classic book, published in Britain originally in 1968 by The Bodley Head Children's Books. It was the author's first book which led to dozens of others and a very distinguished career as a writer and an illustrator. Here's a link to a comprehensive biography on Pat Hutchins (born 1942 in Yorkshire) and a catalogue of her other books: http://www.yourlibrary.ws/childrens_webpage/e-author62000.htm
It's so great to watch the fox going from one disaster to another while Rosie walks unflappable along the farmyard. If only it was like that in the adult world, the bad guys always getting caught and punished before causing any mischief - the bankers for example...