I got something called a "Bark Off" at WalMart. Works off battery and emits a sound that hurts their ears when they bark. I can't hear it but I can tell from his behavior that he really hears it. I only use it when barking might be a problem like in a motel or something. We live in the country so my dog car bark all he wants to at home. I have used it at night a couple of times when he hears another dog barking in the distance and it has affected our sleep!
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