TMZ has obtained the furry mug shot of "
Sons of Anarchy" star
Mark Boone Junior ... taken moments after he was arrested last month for allegedly assaulting a cop.
As TMZ first reported, Boone Junior -- real name
Mark Heidrich -- was arrested last month in Glendale, CA during a routine traffic stop ... after he allegedly flew off the handle and went after the cop who pulled him over.
Mark -- who also starred in "
Batman Begins" -- was taken into custody for assaulting a police officer and resisting arrest -- and was subsequently released after posting $20,000 bail.
As far as we know, animal control wasn't involved.
TMZ has learned ... "
Sons of Anarchy" star
Mark Heidrich -- aka
Mark Boone Junior -- was arrested in Glendale, CA earlier today for allegedly assaulting a police officer.
Law enforcement sources tell us Heidrich was originally pulled over for a traffic violation ... and during the stop ... he went after the cop.
We're told additional officers were called to the scene ... and Heidrich was taken into custody for assaulting an officer and resisting arrest.
UPDATE: Mark has been released from custody after posting $20,000 bail.
