The Dolphins signed Arnette (groin) to the practice squad Wednesday, David Furones of the South Florida Sun Sentinel reports.
Arnette was waived by the Raiders back in November while dealing with a groin injury, but it now appears that he's back to full health. The 2020 first-round pick only ever established himself as a reserve option in Las Vegas' secondary, but he will now get a chance to progress in his development with Miami's coaching staff.