What is "blue dog"

Blue Dog may refer to:

• The Blue Dog Coalition, a group of conservative Democratic Party members of the United States House of Representatives
• Blue Dog Lake, a lake in South Dakota
• Blue Dog, a painting and a featured icon in various works by George Rodrigue
• Blue Dog Records was a London-based independent record label linked to the Barfly club
• The Blue Dog, one of the "blue" public houses and inns in Grantham