Black and tan border collie mix, lost near Kohl's

I lost my dog Milo, a medium-sized black and tan border collie mix, yesterday around 3pm. He wears a blue collar with a small silver tag engraved with my phone number, and he has a distinctive white heart-shaped patch on his chest. We last saw him near the Kohl's on 75th Street, by Green Bay Road in Kenosha-Racine. Milo can be shy with strangers but is incredibly friendly once he warms up, and he’s been part of our family for two years—losing him has me worried and it's really important to get him back.