Dog food manufacturers have choices on how to preserve the
fat in food to prevent it from becoming rancid. They can use the chemicals BHA,
BHT, ethoxyquin, or propyl gallate. If a fat is preserved with these chemicals,
it has a long shelf life and isn’t significantly affected by heat and light.
Even so, many dog owners prefer not to feed these chemicals to their dogs,
especially ethoxyquin, which has been associated with chronic degenerative
diseases, allergies, arthritis, and shortened life spans to name a few.
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A manufacturer also can use natural preservatives, such as
vitamins C and E and rosemary extract. Vitamin E is listed on packages as
tocopherol. Most of the newer foods use these natural preservatives. The
downside to naturalpreservatives is a shorter shelf life — no more than three
to four months (provided the food is stored in a cool, dark place around 40
degrees, refrigerated or frozen).
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