Sometimes they work and sometimes they don't .If you can't tolerate losses of dogs or chickens don't rely on a invisible fence alone to protect your chickens or dogs.In a highly excited state a dog will be tempted to cross one they wouldn't normally cross.If you are unlucky enough to love and own an escape artist be forewarned they will patiently wait for the perfect moment to escape.THis will lead to your dog getting out and possibly injured or killed.I rely on solid barriers to keep my dogs contained inside and everything else out
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