A narrow, shallow cut is made across the driveway for the wire. Once the wire is in place, the cut is sealed with a blacktop compound. Resealing your driveway will not affect the wire. If you are having your driveway repaved, however, ask the paving company to install a 1/2-inch PVC pipe in the driveway. Your underground pet fence installer can then run new wire through the pipe, reconnecting it at both ends.
It is also recommended to put reflectors on the ends of the driveway where your wire is so you do not cut into the corners and damage the wire if you plow your driveway in the winter.