Dog whistles have long been used in training because they produce a high-frequency tone that dogs can hear more clearly than people, and that real-world use is what makes the sound instantly recognisable online. Boosted versions like this one began circulating on soundboards and short-form video apps, where creators amplified the tone so it would still register on phone speakers. It has stayed popular because the reaction is immediate and visual: a pet perks up, turns its head or runs to the source, giving editors a simple, reliable gag without any dialogue.