LOST DOG AROUND LOWRY - Please Help!

Our dog walker lost our dog on 4/16 near Aurora High School. He is a six-year-old male black and white sheltie with brown face markings. Last seen wearing a blue harness running down East 11th Ave toward Lowry Park. He is microchipped. We are very worried. Please help us find him! UPDATE: Still missing as of 4/20. Last sighting around Common Ground Golf Course. Call 415-310-9787 with any tips!!