Cream retriever mix found near Milwaukee Public Market

I found a dog this afternoon around 3:15pm near the Milwaukee Public Market on Water Street. He's a medium-sized, cream-colored retriever mix with a blue nylon harness and a red collar. He has a white patch on his chest, and his left ear flops a little compared to the right. There's a bone-shaped tag that reads 'Milo' along with a phone number, though I haven't been able to reach the owner yet. He seems friendly but a bit anxious after being on the street, and I know how nerve-wracking it is to lose a pet in a big city—really hoping the owner sees this and can reunite with him soon.