Blue BuffaloBLUE Tastefuls Purées with Beef

A red-meat protein, higher in fat and iron than poultry. Fresh or deboned beef is mostly water and ranks higher on the label than its dry contribution; beef meal is the concentrated form. Beef is among the most common food allergens reported in both dogs and cats, probably because it has been fed so widely for so long. Beef by-products such as liver and heart are listed separately.

Starch from the cassava root, used to bind kibble and as a carbohydrate source, especially in grain-free foods. It is nearly pure starch with little protein, fiber or micronutrients, and it is one of the least likely ingredients to trigger an allergy. A food that leans on tapioca for carbohydrate is getting easy digestibility and little else from it, which is fine as long as the rest of the recipe carries the nutrition.

A plant oil with the source unspecified, usually soybean, canola or a blend. It supplies the omega-6 fat linoleic acid, which dogs and cats need for skin and coat. The unnamed source means it can change between batches, which matters little nutritionally since the common vegetable oils are similar. Its omega-3 is the plant form, which pets convert poorly, so a food relying on it will add fish oil or flaxseed for balance.