City Dog, Country Frog is a beautifully illustrated story about an unusual friendship that lasts through the seasons. The realistic illustrations were rendered in watercolor by talented artist, Jon J. Muth. The sweet story was written by popular author, Mo Willems. The book was published in 2010 by Hyperion Books for Children. City Dog, Country Frog is destined to be a favorite among young readers for years to come. I certainly rate it high on my list. Two of my favorite pictures are dog and frog swimming together and the double-page spread with the gorgeous winter scene. Beautiful book!