The exact origin of this oh my dog clip is not documented, but the phrase itself spread online as a family friendly alternative to oh my god. Short reaction audios like this became popular on meme pages and short form video apps, where creators reuse the same surprised line for pet videos, pranks and wholesome surprises. Its appeal is simplicity: anyone instantly understands the joke, it works without swearing, and the short length makes it easy to loop or layer over a visual punchline without explaining the setup.