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You might check the batteries in the collar. They may need replacing. I've heard of dogs who are so smart they stand just at the edge of their boundary and let the collar take just enough hits to run the battery down so they can run free. This may be one of those dogs.
You've had some other good suggestions here as well. Hope they work!!!
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 Marilyn If anyone would like a free Bible Study CD or book entitled "Searching for Truth", PM me with your mailing address and I'll send you one. "And you shall know the truth and the truth shall set you free." John 8:32
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