"Beware of the Dog" is a 1944 World War II story by Roald Dahl which was originally published in Harper's Magazine and later appeared in his Over to You collection. Its basic plot was adapted into the 1965 movie 36 Hours, starring James Garner and Rod Taylor, and the TV movie Breaking Point in 1989.
RAF pilot Peter Williamson sustains a serious injury (the loss of a leg from a cannon shell) while flying a mission over German-controlled Vichy France. He bails out of his plane and later awakes to find himself in a hospital bed in Brighton, on the English coast. As he recovers, strange things keep happening, such as hearing the sound of German warplanes through the window when none would have been nearby. The nurse also mentions that the hospital water is very hard, when Williamson knows the water in Brighton is famous for being soft.
Suspicious and frightened, Williamson drags himself to the window and sees a wooden sign, "GARDE AU CHIEN" (French for “Beware of the