The 49ers have a new defensive line coach.

Sporting News has learned that Jeff Zgonina will be leaving his post as the Giants' assistant defensive line coach to join Kyle Shanahan’s staff.

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Zgonina, 46, played 17 NFL seasons as a defensive lineman with seven different teams. He served as Houston’s assistant defensive line coach in 2013.

While out of the NFL, Zgonina became known for participating in dog shows with his Neapolitan mastiff Nook. Video from the Wall Street Journal can be found here.

As first reported by Sporting News, the 49ers are trying to hire Robert Saleh and Jerome Henderson as co-defensive coordinators. After being fired in Jacksonville, Saleh was set to become San Diego’s linebackers coach before a better opportunity became available in San Francisco.

Henderson is the defensive passing game coordinator in Atlanta, where Shanahan was offensive coordinator before signing a six-year deal Monday with the 49ers.