I never let my dog out alone in TV but she does the same thing at home in IL - chases ground squirrels or chipmunks into the downspout and chews the downspout trying to get to the target. I finally put chicken wire over the end of the downspouts so the critters won't go in. She can't catch them and they just hide somewhere else. She's a 12 lb shih-tzu maltese mix and I couldn't believe how she could tear up a downspout so completely, even when I caught her doing it. I think the sound the animals make in the downspout scratching trying to climb up is so close it just drives the dogs nuts. The dog is so close to the animal it gets real scared, tries to climb up, exciting the dog which tries harder to get to the animal and on and on.
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