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According to AAFCO, the maximum amount of selenium used in a dog food should not exceed 2.0 mg/kg on a dry matter basis — or about 18 times the recommended minimum of 0.11 mg/kg.
And on a caloric basis, the maximum suggested selenium content is 0.57 mg per 1000 calories of food — which is about 19 times the minimum 0.03 mg for the mineral.
Although AAFCO sets a maximum for most minerals, the National Research Council has yet to determine the safe upper limit for many inorganic nutrients — including selenium.
