Animal food. Any article intended for use as food for dogs, cats, or other animals, derived wholly, or in part, from the carcass or parts or products of the carcass of any amenable species, except that the term animal food as used herein does not include:
(1) Processed dry animal food or
(2) Feeds for amenable species manufactured from processed by products of amenable species.
9 CFR § 531.1
As used in this subchapter, unless otherwise required by the context, the following terms shall be construed, respectively, to mean: