It's hard to say because I free feed dry kibble all the time.  I put about 2-3 cups out at a time in two different bowls and when it's gone, I refill.  I suppose I fill the bowls every other day or so, sometimes more frequently.  They also get 1/2 can Innova each per day.  So, to be tiny dogs, yes, they eat quite a bit, but they are very active as well.  Alot of it also depends on WHAT you feed, as the ultra premium foods require a lot less than the grocery store brands.  They would eat me out of house and home if I fed them a cheaper grade food!!!     
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