The phrase "bad dog" is spoken to domestic dogs when they have misbehaved or disobeyed instructions.

Bad Dog may also refer to:

Radio stations

• WGFG, Orangeburg, South Carolina
• WMXZ, Isle of Palms, South Carolina
• WSCZ, Winnsboro, North Carolina
• WWBD, Sumter, South Carolina

Television

• Bad Dog!, a reality series on Animal Planet
• Bad Dog (TV series), a 1998–1999 Canadian cartoon series
• "Bad Dog" (Beavis and Butt-head), an episode of Beavis and Butt-head
• "Bad Dog" (Frasier), an episode of Frasier

Other media

• Bad Dog (comics), a comic series by Joe Kelly and Diego Greco
• Bad Dog (series), a book franchise by Martin Ed Chatterton
• "Bad Dog", a screen saver in the After Dark series
• The Bad Dog Theatre Company, an improvisational theatre company in Toronto, Canada
• Bad Dogs, the male half of Vivid BAD SQUAD in Hatsune Miku: Colorful Stage!