I have wondered this question for awhile, and I thought it would be appropriate to ask on here. Particularly, is there any evidence showing that animals exposed to human language during their development acquire some specific understanding for that language? A dog raised by an English owner seems to understand words of the owner, either by learning or some form of conditioning. Would it be extremely hard for an animal to listen to someone of French or Spanish, for example, later on in their life? Would it be the same degree of difficultly as a human adult during second language acquisition? Sorry for the broad question, just genuinely curious.