Ruff ruff is the classic English written form of a dog's bark, long used in children's books, comics and cartoons before soundboards existed. As short audio clips spread on meme pages and video apps, a clean double bark like this became a handy stock effect because it needs no setup and translates across languages. Creators reuse it for real pets, animated characters and people doing dog impressions, which keeps it in steady rotation for family friendly jokes, pet content and quick edits where an actual dog is not available on cue.