IRVING, Texas—Tony Romo might not want to take the splint off his passing hand the way he and the Dallas Cowboys are playing.

Romo crisply guided Dallas to touchdowns on its first three drives and points on the first four, then turned the early surge into a 34-9 victory over the Seattle Seahawks on Thursday.

The Cowboys won their third straight, matching their best roll of the season, all coming since Romo returned from a broken right pinkie. Dallas is 8-4 and back near the top of the NFC playoff race. Now comes the hard part—staying there.

The Cowboys’ next...

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