Place it right after the dog is shown doing something odd, just before the owner's reaction shot, so the question frames the chaos. Follow it with a Bruh after the question, then a Cat Laugh Meme when the dog doubles down, keeping the sequence focused on the pet's behaviour rather than the person filming.
About this sound
This is a very short, 1.3-second voice clip of someone asking, in a puzzled tone, what the dog is doing. The delivery is blunt and bemused, turning a simple question into a funny reaction to strange, unexpected or suspicious behaviour. It feels playful and lightly mocking, like catching a pet, a friend or a stranger mid-mischief and calling it out in the moment.