It really depends on what food you feed, their poo should be like a log, increase by 1/4 c per meal to see if the poo stays solid, decrease if it starts to look like mushy dog food in a blender. That is the best way to know if they are getting the right amount. Typically at that age it is about 1 1/2 to 2 c per day. Then you can be the judge by appearance, you should start to see a waistline but no ribs or spine.
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