Mark Heidrich

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…

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…