Border collie mix, black/white, lost near Cedar Falls Library

I lost my border collie mix named Scout yesterday around 4pm in the Waterloo/Cedar Falls area. He's about 40 pounds, black and white with a fluffy coat and a distinctive white patch on his chest. He wears a bright blue reflective collar with a red bone-shaped tag and a microchip tag; there’s a tiny white scar behind his right ear. We were near the Cedar Falls Library and the Riverwalk by the bike racks when he bolted after a squirrel and disappeared down the side streets. He’s super friendly and great with kids; we adopted him last year and he’s become part of the family. If anyone spots him, please message me here—I'd really appreciate any help bringing him home.