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If he has some hearing an ultrasonic dog deterrent worked for my old girl. She could hear it, would look to see where the sound came from, it came from me so she would come to me. She could hear most of her life though so not sure how this would work from kittenhood. I imagine it would hurt the ears of your other cat. Sure worked to keep two unfriendly dogs from chasing us when we bicycled, which was why we bought it.
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