LL Bean (and other companies) sell electric collars and remote control
zappers for hunters who need to get their dogs to pretend to be smart. Much
cheaper than the invisible fence option.

"Matt" wrote in message
m...
Perhaps one of those buried electric fences for keeping dogs in the
yard. You could just surround all of your planters or gardens with the
buring wire, and if the dog crosses over (or even gets too close), they
will
get a little harmless zap that will make them think twice about entering
the
garden again. That or a few short lessons with a training (choke) collar
can be quite productive.
good luck,
Matt in MI

"Perry Templeton" wrote in message
...
What can I do to keep dogs from digging in small sandy dirt garden?
That's
safe enough for the dogs and the edible plants...
Perry