I wonder if putting pepper on the ground would help. Cats usually sniff before they dig and they'd sniff the pepper and might go away. It wouldn't hurt your dogs unless they sniffed there, too but they would not do it for long.
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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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