I have dreams like that often enough. I lost my mom a few yrs ago and I have such vivid dreams of her being in the room telling me something. Her voice is so clear that this is what wakes me. At first it scared me but then I started realizing that whatever she had said in my dream always happened or had happened. I still have those dreams but they don't bother me any more. I really believe this is the way our departed ones communicate with us, be it a human or a beloved pet.