Found medium dog with blue harness in Northeast SD

I found a dog this afternoon around 2:15pm wandering near the Northeast SD Community Center at 3rd Street and Main. It's a tan and white mixed-breed, about knee-high, with a bright blue reflective harness and a small silver tag on the collar. The dog has a white heart-shaped patch on the chest and comes when I call the name Mojo, but I didn't see an owner nearby. I checked for a microchip at the Brookside Veterinary Clinic on Maple Ave, no chip found. I'm keeping him safe near the corner by the community center and really hope to reunite him with his family. If this is your dog or you know the owner, please contact me.