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  You can only free feed an animal if it does not overeat.  It sounds like your dog would overeat by free-feeding so I don't think that would be a good idea.  There could be a medical problem causing him to be so hungry all the time. Hyperthyroidism is a posibility, although uncommon in dogs. He could also have worms.  As long as the amount he's eat is keeping him at a healthy weight, I'd continue with what you are doing. Feeding more will only make him gain weight, which isn't healthy.  If he's skinny though, you can feed a little more.  
				__________________ ~Magnifique Yorkies~Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
 Educate yourself and buy from reputable breeders or rescue.
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