Flying Dog Brewery is a beer brewery now located in Frederick, Maryland. Originally opening in Aspen, Colorado in 1990 as a brewpub, it became the first brewery to open in Aspen in over 100 years, and one of the first brewpubs in the Rocky Mountain region. In 1991, Flying Dog's Doggie Style was bottled and won the The Best Pale Ale in America award at the Great American Beer Festival.

The reputation of Flying Dog beers grew quickly, and demand soon exceeded the brewpub's capacity. So, in 1994 Flying Dog opened a 50 barrel brewery in Denver, Colorado from which its ales were distributed to more than 45 states of the United States. Flying Dog purchased a second brewery located in Frederick, Maryland in May 2006, and in January 2008 the last bottles rolled off the Denver line and all production was moved to the Maryland facility.