Do pets really know their own names?

I think that Nakhash is right. I think the way that pet owners say the names of their pets has a lot to do with how the pet reacts. If you say the pets name harshly, they seem to back away and know that you are upset with them. If you say their name in a soft voice they seem to know that you are ok with them. If you say their name in a commanding voice, they seem to know that you want something from them. I think it has to do with the vibration of the voice.