Dog Days is a book written by Jeff Kinney. The statement is about the fourth book in the “Diary of a Wimpy Kid” series. The book was published by Penguin Books in 2009 and has 218 pages. The story revolves around Greg Heffley, who is on summer vacation and prefers to stay indoors playing video games. However, his mother has other plans for him and wants him to spend more time outside with his family.