Small female dog, looks like a mix of beagle and chihuahua. Brown and white, wearing a red collar with no tags, very quiet, friendly but shy. She may have given birth recently. Found on Quinnipiac Ave.; neighbors report she was wandering around early this morning (3 AM, 7/19/17) but ran away when they tried to help her.
Update: she's at the Animal Control shelter on Fournier Street now. No one in the neighborhood had seen her before this morning, so she must be some distance away from her home, with a better chance for her owners to find her there. I will provide further updates.