Neither quarterback got everything to his liking Saturday night.
At least Tannehill's side left with a victory.
All five of the game's touchdowns came with most of the starters already done for the evening.
Tannehill played into the third quarter, completing 13 of 21 passes for 119 yards. His only big mistake was his final throw, an interception inside the Dallas 10 on Miami's opening possession of the third quarter.
It was the first interception in 41 preseason throws for Tannehill, who is one of the biggest reasons why Miami thinks this could be a breakthrough season.
"You can see the things that we're doing," Dolphins owner Stephen Ross said on the game broadcast. "I'm expecting much better things."
"It was good to see Tony out there playing," Dallas coach Jason Garrett said at halftime. "He got knocked around a little bit, and that could be good and bad. . It's good to have him feel the physical part of the game."
Romo noted there are some things Dallas has to clean up.
"It felt good to get through a half," Romo said. "We want to put more points on the board, but we hurt ourselves with penalties. The game is always going to be hard if you keep putting yourself behind."
Patmon picked off a screen pass from Moore with 7:17 left, reading the play perfectly, but Miami - playing with no available placekicker - scored the game's final 14 points.
Another notable good sign for Miami was the preseason debut of Knowshon Moreno, the team's offseason acquisition at running back. He got loose for a 19-yard gain on his first touch of the preseason schedule. He finished with 64 yards on 10 carries.
Miami took an 11-6 lead in the third quarter when Dallas' defense couldn't find a way to stop Damian Williams.
Copyright 2014 by The Associated Press