The public appeal of the Cowboys and the market being down on the Rams after last season's disappointment have produced a mispriced line here. The Rams should not be a field goal home 'dog to Dallas.
Although there will be no fans in the stand, the Rams have extra motivation for a 44-21 embarrassing loss they suffered to the Cowboys last season and this being the first game at their new SoFi Stadium. 
Jared Goff is close to an elite quarterback - when he's playing at home where he has a 31-to-11 touchdown-to-interception ratio the past two seasons compared to a 22-to-17 ratio on the road during this time span. Goff is a pocket passer. The Cowboys don't have their full complement of star pass rushers yet. Dallas' secondary is the most vulnerable part of its defense. 
Dallas has a high-powered attack. However, the Cowboys' offense may need time to get into gear. Mike McCarthy didn't coach last year. He had a shortened offseason and no preseason to implement his style. The Cowboys are down two of their offensive linemen from a year ago being minus center Travis Frederick and right tackle La'el Collins.  
Then there is the Cowboys record as a road favorite. It's not good. Dallas lost straight-up laying points on the road last season to the Eagles, Bears, Jets and Saints, who were using Teddy Bridgewater at quarterback.