Dog Days (stylized as DOG DAYS) is a Japanese 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. The series ran for 13 episodes on Tokyo MX and other channels from April to June 2011. A second series, titled Dog Days', ran for 13 episodes from July to September 2012. A third series, titled Dog Days″, ran for 12 episodes from January to March 2015.

A light novel adaptation with four chapters was published by Kadokawa Shoten, and serialized in the Newtype magazine between March and July 2011 issues. Kadokawa Shoten also published a Dog Days manga illustrated by Takuya Fujima, which serialized in three different magazines from May to November 2011. Several drama CDs have also been produced, as well as a comic anthology.