Diary of a Wimpy Kid: Dog Days by Jeff Kiney

Diary of a Wimpy Kid: Dog Days is a realistic fiction novel written by American author and cartoonist Jeff Kiney, the fourth book in the Diary of a Wimpy Kid series. It was released on October 12, 2009 in the USA and Tuesday, October 13, 2009 in Canada. The cover mainly depicts Greg with a beach towel and an empty ice cream cone, looking down at the ice cream (on the ground).
The book Diary of a Wimpy Kid: Dog Days opens describing Greg's worst summer ever beginning with Greg Heffley and Rowley Jefferson going to Rowley's country club after school closes for the summer, but Greg is kicked out due to his complaining of the smallest of predicaments. The beach trip that he was looking forward to is canceled because the money went tight, so the Heffleys resort to going to the town pool, which Greg hates because of its hairy and rotund visitors.
Greg and Rowley have a sleepover together, and watch a horror movie taken from Rodrick's room. After the movie, Greg and Rowley soon become paranoid on account of a muddy hand that might strangle them, which was in the movie. Unfortunately for Greg, his mother, Susan finds out about the movie after Greg's father told her when he found them sleeping in the bathroom, and then she starts a reading club in which he is the only participant after two days. The reading program, however, is put to a stop when Mr. Jefferson arrives with a huge bill that Greg and Rowley spent on fruit smoothies at the country club, and he forces Greg and Rowley to pay it off. (Summary by Wikipedia)