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Title: Not so good on older dogs....
Review: I bought this to help deal with an older dog next door. I feel really bad for the dog, but hey, I gotta get sleep once in a while too. I had high hopes for this device after reading many of the online reviews but am sad to say it failed miserably. Perhaps because the dog is so old, it may have lost some of its hearing. I don't know. Either way, it didn't work for me. Setting the tone to the lower (audible) version did nothing more than frighten my cat and irritate me everytime the dog barked. So that didnt work either. :-(My recommendation would be to not buy this if the dog you are attempting to silence is older.
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