The 6-foot-5, 305-pound Merling was arrested Wednesday in Weston, Fla., and taken to Broward County Jail. A court appearance was scheduled for later Thursday. In Florida, aggravated battery is considered a second-degree felony.
It was unknown if Merling had a defense attorney and a call placed to his agent, Jimmy Sexton, was not immediately returned.
Merling had 33 tackles and 2½ sacks for the Dolphins last season. The Dolphins are scheduled to hold a three-day minicamp for veterans starting Friday.