Aww I hope you find your baby soon !! its so horrible to loose your dog
I reccomand walk around the neighbourhood with lots of food that he loves (wet can food for example all dogs love that ! or hot dogs) and try to call his name or something he would come to if you call that.
Also if you havent already advertise that he's lost all over the town in stores etc.
Is he microchipped ? if so you will propably find him !