On one hand, dog communication lacks grammar, so the concept of having nouns / names for things (including themselves) is a bit beyond their grasp. Of course they can learn to associate particular words with meaning (“Walk?” “Bad dog!”), much as we do with their barks and body-language. Perhaps the more intelligent ones learn to interpret their names as signals that the human is addressing them. It is possible for a determined skeptic to interpret human behavior in similar terms!