Dalton (toe) is doubtful for Sunday's game against the Commanders, Scott Bair of the Falcons' official site reports.
Dalton appears to have suffered the injury during the Falcons' Week 11 win over the Bears, when he recorded one tackle. He began the week with a limited session but has failed to practice on the two subsequent days. That leaves him unlikely to suit up, potentially leaving Atlanta thin across the defensive line.