It's a similar case for the betting odds, though favorites don't always have a ' - ,' especially in sports like baseball, hockey or soccer where final results are often decided by one run or one goal. Similarly, if you bet the Packers +7, as long as they lose by less than seven points or win outright, you win your bet.
If you bet the Cowboys -7 and they win by more than seven points, you win your bet. For example, you can bet the Dallas Cowboys as a -7 point favorite to beat the Green Bay Packers or the Packers as a +7 point underdog.
In terms of the spread, the ' - ' always refers to the favorite and the ' + ' always refers to the underdog. The plus (+) and minus (-) in sports betting can refer to either the point spread or betting odds.
