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Message: <blockquote data-quote="Frank Pope" data-source="post: 4164561" data-attributes="member: 44975"><p>There are several battery powered ultra sonic whistles that deter bad canine behavior.  I have one and when the neighbor's dogs attack the fence, I saunter out and give them the works.  Since it is so high pitched that humans can't hear it, you can remain out of the picture.</p></blockquote><p></p>