What gets me is so many fans thinking the Cowboys-49ers rivalry was rooted in the 90's. Not so.
And no, it never started in the 80's with "the Catch" either.
From 1970 to 1972 the Cowboys made it to three consecutive NFC championship games which included two Super Bowl appearances. They accomplished this by defeating the 49ers in the playoffs three consecutive seasons. The first two were NFC Championship games, the last one was a divisional come from behind game with Roger Staubach.
Those three seasons, and just one more in 1957, were the only playoff years for the 49ers between 1950 and 1980. During that 30 year period, they were 2-4 in the playoffs with three of those losses to the Cowboys.
That is the real root of the Cowboys hatred by SF and their fans
The HC for the 49ers was Dick Nolan. Does the last name sound familiar? Nolan had been an assistant coach for Tom Landry in previous seasons. Their QB was 1st team All Pro John Brodie, the NFL MVP in 1970.