"Woof Woof" is one of the common ways of representing the bark of a dog in the english language, along with ruff ruff, arf arf, yip yip and yap yap. However in different parts of the world other cultures hear the sound of a dogs bark differently.
French - waouh, waouh; ouah, ouah; vaf, vaf; ouaf, ouaf; wouf, wouf; wouaf,wouaf; jappe, jappe
German - wuff, wuff; wau, wau
Spanish - guau-guau; gua, gua; jau, jau
Dutch - blaf, blaf; kef, kef; waf, waf; woef, woef
Chinese, Mandarin - wang, wang
Welsh - wff, wff
Polish - hau, hau
Italian - bau, bau
What does your dog say ?