What language does your dog bark in?

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I read a funny article in a dutch magazine that looked at why a dog in dutch says 'waf'-waf' while in for example english it's bow-wow. Personally I think that neither sounds particularly dog-like. Apparently in Spain they say 'guau-guau', in France it's 'ouah-ouah' and in Japan 'wan-wan'.

Of course it's got to do with the different sounds the various languages give to different letters and also how different peoples hear the different sounds. But isn't that interesting really, that a dog barks the same the whole world over, but humans hear it differently.