My younger brothers did a lot of raccoon hunting/trapping and occasionally saved their penis bone. They'd clean it up nice, and then when friends would come over they'd ask what it was, and my brothers would say it's a dog whistle. And invariably, boy or girl, these folks would try to blow the thing (probably being prompted to do so by my kin) and they'd say, "I can't hear anything."
And my brothers would say, "Of course you can't, it's too high a pitch for our ears. But dogs can hear it."
Some weren't too happy to find out what it really was.