Languages were created by mankind, specifically for its own species as a form of communication. Dogs, cats or any other animals will not understand any languages created by mankind .... but they can be trained to response to a certain words/sentence/sound/noise/tone and also to respect to the trainer to who or what the animal should response.
So technically, you can train a dog to sit in "sit" in English and to run in "sit" in Chinese, or to jump in "sit" in Malay .... and of course, another dog will not understand any of these if it was not trained at all.:think:
This is naturally difference from being able to give a reflex response .... such as if one carries a big stick and yells lots of hokkien vulgarities or any other languages and you can see any dogs or cats will run for their lives ......:bsmilie: