Well some is OK it is normally fast pulsed or indeed RF based but costly. as
has been noted though, it very seldom works for cats. they tend to learn how
to bypass this sort of device and you cannot electrify the whole side of
your property.
A few weeks with a water pistol can work wonders though.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Rod Speed" wrote in message
...


"Cursitor Doom" wrote in message
news
On Sat, 23 Sep 2017 11:34:47 +0000, Chris wrote:

Any other fencing systems worth considering?

Electric. See your local agricultural suppliers.

Doesn't work with cats and isnt legal for houses anyway.