My rescue eats like crazy!! After she finishes, she walks around and scavenges for food. I feed her more than my own dogs...and she's only 3 lbs... She eats WAY more than Emma who is also 3 lbs. We have to beg Emma to eat!
I've never seen such a small dog eat that much. She also eats so fast...she doesn't chew! She swallows! You won't see the food after 5 minutes of giving it to her.
It is suspected that she was starved before...I don't know if she'll ever grow out of that habit though.