I will measure out my handfuls when I get home to see if it is really a cup per day and then reduce if it is. Callie seems like she doesn't eat enough.. she is sucks it in and then waits for Bella to finish.
Be sure to read the feeding guide on the bag of food. Remember most dog food companies make the feeding guide for active dogs that exercise at least an hour a day. if your dog exercises less, you'll have to feed less than what the guide says.
1 1/3 cup seems like quite a bit of food for a pup under 10 lbs IMO....but I know puppies need more ....if it were me I would try cutting back just a tad to see what happens......if they seem to drop weight then you can always up it again
as far as dogs gulping down food and looking for more.......thats normal for many dogs.....my dogs would try to eat the whole bag if I let them