Golden retriever mix with blue polka-dot collar lost in Bozeman

I lost Milo, my 4-year-old golden retriever mix, yesterday around 3pm near the Bozeman Public Library on East Main Street. He's about 60 pounds, with a golden coat, a white chest patch, and a blue polka-dot collar plus an orange reflective harness. He has one blue eye and one brown eye, and a small scar above his left eyebrow from a playful tumble last summer. He's friendly but a bit nervous around cars, and he's our daughter's best buddy—we really need him back. If you've seen him, email [email protected] with any info; any clue helps.