The phrase what da dog doin became a viral internet catchphrase, shared widely in short pet videos and reaction memes on TikTok and other social platforms. Its appeal is simple: it gives creators a ready-made, funny way to narrate a dog behaving oddly, without needing any explanation. Because the line is short, instantly recognisable and easy to drop over almost any animal clip, it has stayed in rotation long after its first viral wave, especially in pet compilations and lighthearted reaction edits.