It is the second similar incident in the area this week,
The K-9 officer was responding to a burglary-in-progress call in the south area about 7:30 a.m. when the object broke his windshield and dented the hood of his car. The officer was on southbound on Highway 99 near Martin Luther King Jr. Boulevard with his lights and siren activated.
Police said that the object might have been thrown from the MLK overpass.
Other police officers could not find a suspect or the object that hit the car. The officer was not injured.
The CHP said that earlier this week a private citizen's car was struck by a brick on Highway 99. The brick was thrown from near a pedestrian overcrossing in the same general area where the police officer's car was hit, authorities said.
PHOTO CREDIT: Damage to the front end of a Sacramento police car show where an object, thought to have been thrown from a Highway 99 overpass, hit the vehicle.