Tan-and-white beagle mix dog named Baxter, blue collar

I lost my tan-and-white beagle mix named Baxter yesterday around 3pm. We were near the Boston Public Garden's Arlington Street entrance when a cyclist startled him and he bolted toward Commonwealth Avenue. He's about 25 pounds, with a tan and white coat, a heart-shaped white patch on his chest, and a tiny scar on his left hind leg. He wears a blue reflective collar with a silver tag that reads 'Baxter' and a small red heart tag. This dog is basically family to me, and I really need him back.