The Effect of Electronic Pet Fencing on ICDs

The Villages in Florida doesn't allow traditional fencing.  They also have a strict leash law, so many homeowners have opted for invisible electronic fencing to contain their pets.

One of my neighbors recently had an ICD placement.  In reading through the manual I noticed that in addition to airport security there were several situations to avoid, one of which was the invisible fencing. I inquired whether it was the invisible dog fencing or the more visible fencing for livestock.

I can avoid livestock fencing, what about the invisible fencing?  Does it generate a magnetic field?  The scary part is you don't even know it's there, if you're just walking along what is the vulnerability factor?

Guess it's just something else to think about as you step off the curb.