Treat the part under the door the same way you do the rest of the run fencing. (Either buried wire, or an apron, or whatever). Ta da
As for how long wire will last underground, it totally depends on the wire gauge, the quality of the galvanizing, what your soil is like, and how wet it is. That is one advantage of an apron rather than buried wire -- you can CHECK it periodically, and replace when needed.
Good luck, have fun,
Pat
As for how long wire will last underground, it totally depends on the wire gauge, the quality of the galvanizing, what your soil is like, and how wet it is. That is one advantage of an apron rather than buried wire -- you can CHECK it periodically, and replace when needed.
Good luck, have fun,
Pat