Me: If humans lose the ability to hear high frequency volumes as they get older, can my 4-week-old son hear a dog whistle?
Why this joke works
The Dog-Whistle Assumption
Human hearing generally loses sensitivity to higher frequencies with age, which makes the baby question initially sound plausible. A dog whistle produces frequencies intended for dogs and usually above the range humans can hear. The doctor answers that scientific issue, but the speaker reveals a different interpretation: “Can my son hear a dog whistle?” is treated as though a dog must perform the whistling. The punchline exploits grammatical ambiguity about whether “dog” describes the whistle or its user.
A closer look
Why the Long Setup Helps
The unusually specific age and medical wording make the exchange sound like a sincere hearing question. That seriousness keeps attention on human frequency ranges, so the listener is less likely to inspect the phrase “dog whistle.” The final sentence then dismisses the entire consultation with a childlike literal reading. A calm delivery works best because the speaker’s misplaced confidence is part of the comedy.
Fact behind the joke
High-Pitched Sounds Often Fade First
Age-related hearing loss commonly affects high-pitched sounds before lower ones. That real pattern gives the opening question a scientific foothold, even though the punchline abandons hearing science altogether. A dog whistle is named for the animal expected to hear or respond to it—not for an animal producing the whistle.