Houck, whose contract with the Chargers expires on Monday, worked wonders last season with a San Diego line that included two rookies and a few no-names.
Houck replaces Tony Wise, whose unit was a disaster each of the last two seasons. Wise interviewed for the same position with the Oakland Raiders, and he is said to be one of two candidates for the job.
The other late addition to the Dolphins staff is Charlie Baggett, who was hired as wide receivers coach. Baggett held the same job with the Vikings last season.
Baggett, who worked with new Dolphins head coach Nick Saban at Michigan State in the late 1990s, was selected over incumbent Jerry Sullivan and former Dolphins receivers coach Robert Ford, who was fired by Arizona after the season.
Sullivan wound up accepting the receivers coach position with the San Francisco 49ers.
Also taking another job was Jim Bates, who was hired as defensive coordinator of the Green Bay Packers.
The Dolphins have interviewed Tampa Bay secondary coach Mike Tomlin and former Cleveland defensive coordinator Dave Campo for the position, but Saban was said to be interested in New England linebackers coach Dean Pees.
But there are now reports that Pees, who is under contract to the Patriots beyond this season, will be denied permission to interview for the Miami job.
So that means it might be a little while longer before the Dolphins have themselves a new defensive coordinator.