Beagle mix Milo, blue collar missing

Hey, I lost my beagle mix, Milo. He's about 1.5 years old, with a brown and white coat and a distinctive black patch over his left eye, plus a small heart-shaped white patch on his chest. Milo wears a blue nylon collar with a yellow name tag that says 'Milo' and a tiny silver bell. I last saw him yesterday around 3pm near the Bon Accord Centre on Union Street in Aberdeen, and he bolted when a delivery truck backfired, heading toward Pittodrie Street. He's super friendly but scared of crowds, and I'm really worried—Milo was a gift from my sister and means the world to me.