When I was 6, we had hearing tests at school. The nurse set the thing, didn’t see I had the headset on, and blew my ears out. She was amazed that I could hear that frequency. I could also hear dog whistles. I was asthmatic, too. I lost that ability around the 7th grade or so. Thanks for the memory!
It’s so so obvious that the author knows about boys and dogs! They do exactly this sort of thing.