Dulin was carted off the field during Wednesday's practice due to an undisclosed injury, Kevin Bowen of 107.5 The Fan Indianapolis reports.
Dulin worked with the second-team offense in the Colts' preseason opener against the Bills last week as he tries to win a role as the No. 4 or No. 5 receiver. The Colts view Dulin as a core special teams player, so he should be a safe bet to make the team's Week 1 roster, provided his injury isn't serious enough to warrant placement on injured reserve.