Does Tipper Know It’s Not Chicken?

As I sit here eating a lunch of Chik’ n Nuggets (a vegetarian substitute), Tipper, our dog, is sitting next to the desk begging for any part that I’m willing to share.  She behaves exactly like she would if I were eating real meat.  She snaps up the morsels I send her way.  Does she know it’s not meat?  Does she care?