In order to use industry ratios, you must define your industry using NAICS.
NAICS (pronounced "nakes", rhymes with "snakes") codes are used by the government and publishers to organize and present industry data. Most of the sources of industry ratios listed in this guide use NAICS.
NAICS codes classify establishments based on similar processes or means of production. Codes use a two to six digit level of detail, from broad sectors like manufacturing and retail (2-digit codes) to individual industries (6-digit codes).
31 - Industry Sector - Manufacturing
311- Industry Sub-sector – Food Mfg
3111- Industry Group – Animal Food Mfg
311111- Industry –Dog & Cat Food Mfg