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Helping A Blind Dog Out - Okay, you'll all be my patent witnesses. I'm stating it here: Why this huge cumbersome thing, when a beeping collar slightly higher than humans can hear could be used to teach a dog to echolocate like bats? If the dog is deaf, that's another matter. A simple beeping circuit collar could be contrived for dirt cheap, and dogs are plenty smart enough to learn to make use of that sound.