My Dexter is a 5lb PIG!
He will eat and eat and eat until he throws up if I let him. Not his dog food though, oh no. He does not discriminate either. He will eat pickles. Seriously last night I was giving them little pieces of veggies from the salad I was making, some red pepper pieces, cucumber, mushrooms and Dex will eat them all, Fletch does not like mushrooms or cucumbers but he loved the red pepper. Whenever anyone is in the kitchen Dex is right there waiting for something to fall. He whines, jumps on my leg to be fed something. The worst of all is that I don't feed them people food all that often at all, so I have no idea where this expecting it comes from!
You'll have to teach Tatum a word that she'll know that means to stop or go somewhere else. If I say "Kitchen" to my boys they both go to their bed in the kitchen away from the food where they cannot beg on me. Its helps me a lot!