I have the invisible Fence brand... works great... They do have a selection of different collars... a regular Collar with two prongs, another regular with 4 prongs... All the way up to a 8 or 10 prong harness they can put on really stubborn dogs... They can also change the level of correction for each type of collar...
Sounds like you already have a regular fence, so this might be a good add on for you... also I agree with a few others... training is the key, I paid for their trainer to come out for 4 sessions... Plus worked with Ginger between classes... Whenever Ginger tests the system, I do a little refresher with her of the boundaries...
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