Dog whistles are a familiar tool in pet training, designed to produce a high pitch that dogs hear clearly over distance, and recordings of that sound have become a staple of online soundboards. Creators reuse the loud version because it is instantly recognisable even on phone speakers, where softer tones can get lost. It appears in pet compilations, prank clips and short-form reaction videos, often as a way to test whether a dog in the room will respond. Its simplicity keeps it useful: no dialogue or context is needed for the joke or the reaction to land.