Dog Food Label "Rules"

The 95% Rule: If the product says "Salmon Cat Food" or "Beef Dog Food," 95% of the product must be the named ingredients. A product with a combination label, such as "Beef and Liver for Dogs," must contain 95% beef and liver, and there must be more beef than liver, since beef is named first.
The 25% or "Dinner" Rule: Ingredients named on the label must comprise at least 25% of the product but less than 95%, when there is a qualifying "descriptor" term like "dinner," "entree," "formula," "platter," "nuggets," etc. In "Beef Dinner for Dogs," beef may or may not be the primary ingredient. If two ingredients are named ("Beef and Turkey Dinner for Dogs"), the two ingredients must total 25%, there must be more of the first ingredient (beef) than the second (turkey), and there must be at least 3% of the lesser ingredient.
The 3% or "With" Rule: A product may be labeled "Cat Food with Salmon" if it contains at least 3% of the named ingredient.
The "Flavor" Rule: A food may be labeled "Turkey Flavor Cat Food" even if the food does not contain such ingredients, as long as there is a "sufficiently detectable" amount of flavor. This may be derived from meals, by-products, or "digests" of various parts from the animal species indicated on the label. Source: Animal Protection Institute