There is a tendency among the users and sellers of electrified fences
against the use of barbed wire.  Once again, it is the legal and
liability problems.
 
Animals, particularly pets with collars, as well as people could be
ensnared and held by the by the barbed wire and severely injured or
killed by the continuous shocking.  Multiple smooth wire fences with hot
wires alternating with grounded wires provide a shock waring without the
same chance of entrapment.
 
Electrified fence construction is usually availabe at your local farm
supply store.
 
Burns