Terms of Merling's contract were not disclosed.
Merling has appeared in 15 games over the past two seasons, posting seven tackles and three passes defensed in limited action. Because Merling was not activated off the reserve/non-football injury list in time to earn an accrued season in 2010, he was not eligible for unrestricted free agency this offseason.
The Dolphins had placed an original-round restricted free-agent tender on Merling, which included a non-guaranteed base salary of $1.26 million for the 2012 season, but chose to release him on April 23 after he signed.
Merling adds depth to a Packers defensive line that is currently expected to be without free-agent addition Anthony Hargrove for the first eight games of the season. Hargrove was suspended because of his involvement in the New Orleans Saints' "bounty" scandal. Hargrove is currently appealing his suspension.