[Dailydrool] invisible fence 'boundary aggression' ?

[Shirley Grange]

We have an invisible fence which has been great for our dogs for over  
10 years.
Now we have Roscoe, age 4, who barks frantically and runs back and  
forth along the fence when
walkers, runners, dogs, etc. go by our front boundary.  This has  
always been his little game and
his excitement for the day, but recently he has started dashing  
through the fence.  Then he
comes back!  We have tightened his collar, widened the 'field' and  
changed the setting on his
collar to not beep, but just zap.  I honestly don't know if he's  
getting the zap, but maybe he is
and he just doesn't care.  He scares some of the people when he does  
this and also kind of
wants to start a dust-up with the dogs.  This is not acceptable, but  
we don't know what to do
about it.  I know a lot of people are not keen on invisible fences,  
but  they have worked so well
for us for so long and for 4 bassets.
Thanks so much for any ideas anyone might have!     -S.Grange, Maine