Black Labrador mix with red collar near Broad Street

I lost my black Labrador mix named Scout yesterday around 3pm near the Covered Market on Broad Street in Oxford. Scout is about 60 pounds with a short black coat and a white patch on his chest. He wears a bright red collar and a blue name tag that says 'Scout'; there's a small scar on his right ear from a toy incident last year. He can be a little wary of strangers but he's friendly and loves treats. Our family is really worried—Scout means the world to us and I really need him back.