The expression dog days refers to the hot, sultry days of summer, originally in areas around the Mediterranean Sea, and as the expression fit, to other areas, especially in the Northern Hemisphere.

is a 2011 Japanese fantasy anime television series created by Masaki Tsuzuki, also known for his work as creator of Magical Girl Lyrical Nanoha and produced by Seven Arcs and Aniplex under the direction of Keizo Kusakawa. The story revolves around a boy named Shinku Izumi, who is summoned to an alternate world by Princess Millhiore in order to defend Millhiore's country, the Biscotti Republic, from the neighboring kingdom of Galette. Dog Days aired 13 episodes on Tokyo MX and other channels from April 2 to June 25, 2011. A second anime season aired 13 episodes from July 7 to September 29, 2012 on Tokyo MX and other channels. A third season started airing in January 2015.