This sound is commonly shared online as a dog reaction clip rather than for a widely credited film or TV source. It appears in short meme edits, pet compilations and reaction videos where a sniffing noise makes a scene feel more curious, cautious or judgmental. Its popularity comes from how instantly readable the action is: one short sniff can sell the idea that a dog, or even a person in an edit, is investigating something. Because it is so brief, creators keep reusing it in loops, zoom edits and caption jokes.