MerrickFunctional Gut Health Dry Dog Food with Chicken

The most common protein in pet food, and for dogs one of the most common food allergens, with beef and dairy. If chicken is what your pet reacts to, it hides everywhere: chicken fat, chicken broth, chicken meal, natural flavor. On a label, chicken listed first is weighed with its water still in, so a food leading with fresh chicken often has less chicken protein than one leading with chicken meal. Neither is better; they are different measures.

Rice with the bran layer left on, which keeps more fiber, B vitamins and minerals than white rice. It is well digested by most dogs and is a common carbohydrate in sensitive-stomach foods. It digests more slowly than white rice and keeps blood sugar steadier, so it turns up in weight-control foods too. For most dogs and cats it is an unremarkable energy source.

A cereal grain used as a slow-digesting carbohydrate. It is high in soluble fiber, especially beta-glucan, and has a lower glycemic effect than rice, which is why it turns up in weight-control and diabetic foods. Pearled barley has had the hull removed, which lowers the fiber somewhat. Barley grass is a different ingredient, a young green shoot used as a vegetable.

A whole grain used as a carbohydrate and fiber source. Oats are well digested, higher in protein than rice, and contain beta-glucan, a soluble fiber linked to steadier blood sugar. They are a common choice in sensitive-stomach and weight-control foods. Oat fiber is the hull, which is mostly insoluble fiber; oat flour and oatmeal are the whole grain milled. Grain allergy is rare in pets.

A poultry protein, similar to chicken in nutrition and usually a little leaner. Fresh or deboned turkey is mostly water and ranks higher on the label than its dry contribution; turkey meal is the concentrated form. Turkey is often used as an alternative for pets that react to chicken, but the two are related birds and some pets react to both, so it is not a guaranteed swap.

Rendered fat, a concentrated energy source and the main supply of linoleic acid, an essential fatty acid for skin and coat. Rendered fat carries very little protein, so many chicken-allergic pets tolerate it, but not all do, and a strict elimination diet avoids it. Usually preserved with mixed tocopherols. Not a quality concern; a good fat source.

A root vegetable used as a carbohydrate source, especially in grain-free foods. It supplies energy, fiber and beta carotene and is well digested by dogs. There is no good evidence it beats rice or oats nutritionally, though it is a reasonable choice for pets that do poorly on grains. Like any starch, a food that lists it high is a starch-heavy food.

A complete, highly digestible protein, which is why formulators like it. It is also a documented allergen in about 4% of dogs with food reactions. Egg allergy does not implicate chicken meat; the proteins are different. Dried egg product is the same thing with the water removed. A good ingredient for most pets and a fine-print one for the allergic few.

A plant source of omega-3 fat (alpha-linolenic acid) and fiber, used in about a third of dog foods for coat and stool quality. Dogs and cats convert plant omega-3 to the useful forms inefficiently, so fish oil does the job better. Flax is not a documented common allergen, though some pets tolerate it poorly, most often as loose stool. Fine in a food; not a reason to prefer it over one using fish oil.

The dried cells of yeast, often a by-product of brewing. It is rich in B vitamins, protein and minerals, improves flavor, and contains compounds that may support gut bacteria. Despite a persistent myth, there is no evidence it repels fleas. Yeast is an uncommon allergen in pets. Yeast culture is a slightly different product, a fermented feed that supplies similar nutrients.

A plant oil added as a source of linoleic acid, the omega-6 fat dogs and cats need for skin and coat. It is cheap, stable and well tolerated. Sunflower oil contains no omega-3, so a food that uses it as the main fat will usually add fish oil or flaxseed for balance. The high-oleic variety is lower in linoleic acid and used mainly for shelf stability.

A legume plant, the same one fed to horses, dried and added as a source of fiber, vitamins and chlorophyll. It appears in small amounts and gives kibble a greenish fleck. Alfalfa is safe for dogs and cats at these levels. The protein it contains is small and poorly digested by carnivores, so it adds little nutrition.

A fruit added for fiber, a little natural sweetness and antioxidants. Apple flesh is safe for dogs and cats. The seeds contain a trace of a cyanide-forming compound, which matters for a dog eating whole apples and is far below any concern at the amounts of pomace or dried apple in a food. Apple pomace is what remains after juicing and is mostly fiber. In either form it appears in small amounts and does not change the nutrition of the food in a meaningful way.

A vegetable that contributes a little fiber and beta-carotene and a lot of label appeal. In dry food it is usually present in small amounts well down the list. It is not an allergen of concern and not a meaningful protein or calorie source. Fine to see; not a reason to choose one food over another.

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.