Every bully is different. My Harlea only gets 1 cup twice a day and it has been that way since shortly affer we brought her home. Poo will tell you a lot and in our situation any more that 2 cups a day was causing her to have explosive poo. So you just have to do a little trial and error to find what is best whether it is 2 or 3 meals a day. If the poo gets runny just cut back on the amount a bit until the poo is firm but not rock solid.
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