How many Super Bowls have Dallas lost?

The Cowboys have been in a record eight Super Bowls and have lost three times:
  • Super Bowl V (1-17-71) -- Baltimore Colts 16, Dallas 13.
  • Super Bowl X (1-18-76) -- Pittsburgh Steelers 21, Dallas 17.
  • Super Bowl XIII (1-21-79) -- Pittsburgh 35, Dallas 31.