We got our husky microchipped as a puppy when she was spayed. Our vet was very skeptical, but a couple months later she squeezed through our fence gate and was returned within minutes because the dog warden spotted her and scanned her. We lived in the middle of nowhere in Illinois, not even close to any big city.
Our vets have always done our dogs. Keep searching! Like us, one day you may be very glad you did.