Tony McDaniel suspended one game
ESPN NFL Insider Adam Schefter first reported the suspension.
He'll miss next Monday's game against New England.
McDaniel was arrested on a charge of domestic violence in February. Police said he got into an early-morning fight with his girlfriend at his home.
McDaniel has three tackles in three games for Miami, all as a substitute. He'll be eligible to return to the active roster Oct. 5, the NFL said Monday.
A fifth-year player from Tennessee, he joined the Dolphins in 2009 after playing his first three years with Jacksonville. He has 56 tackles in 44 career games.
Information from The Associated Press was used in this report.