So we're doing the opposite. As we're in the German spesking part of europe, our dog listens to English to not interfere with daily talk. It's IMHO one of the best choices to take a foreign language for your dog. You can also use different languages for different setups (e.g. to differentiate fun, working). Dogs anyway don't speak the language, they just listen to the voice, but as an owner it's easier to set context by moving to a different language.