A Santa Rosa man has been arrested for DUI and having an unregistered gun. On Sunday evening, a crash happened on the 1500 block of Tammy Way in Santa Rosa. A pick-up truck hit a fire hydrant and the driver drove off. Police responded and found the truck about four blocks away. Officers contacted the driver, 43-year-old Mario Gonzalez Dominguez, and noticed he seemed intoxicated. His blood alcohol content was three times the legal limit. Police searched the truck and found an unregistered loaded semi-automatic handgun. Dominguez was charged with four felonies including DUI and possession of an unregistered firearm.