Why in the world would any dog food manufacturer put this much brewers dried yeast in their product.  Chicken meal contains a very tiny amount of glucosamine and this is the only company to make such a ridiculous statement. Fish oil is an unknown product which most likely contains Ethoxyquin, a preservative banned in human food. All the grains are low quality grains. Seeing beet pulp this high tells us they had an issue with diarrhea with this food. Salt should not be in dogs food. Menadione sodium bisulfite complex is a synthetic Vitamin which is very harmful to dogs, to include serious liver issues. This is a very low grade dog food.
Purina Pro Plan Select Beef & Barley Formula Ingredient Analysis

  1. Beef
  2. Barley
  3. Brewers dried yeast
  4. Brewers rice
  5. Chicken meal

When the beef is done getting processed it well lose at least 40% of its mass moving it done the list.

Barley is a medium grade grain.

Brewers dried yeast should not be in dog food.

Brewer’s rice is a very low grade rice.

Chicken meal is a good source of meat for dogs.

Purina Pro Plan Select Beef & Barley Formula Ingredient List

Beef, barley, brewers dried yeast, brewers rice, chicken meal (natural source of glucosamine), dried egg product, oat meal, animal fat preserved with mixed-tocopherols (form of Vitamin E), dried beet pulp, pea protein, fish oil, natural flavor, salt, potassium chloride, calcium phosphate, dried carrots, dried tomatoes, dried sweet potatoes, calcium carbonate, Vitamin E supplement, L-Lysine monohydrochloride, zinc proteinate, DL-Methionine, L-ascorbyl-2-polyphosphate (source of Vitamin C), manganese proteinate, ferrous sulfate, niacin, copper proteinate, Vitamin A supplement, calcium pantothenate, thiamine mononitrate, riboflavin supplement, Vitamin B-12 supplement, pyridoxine hydrochloride, folic acid, Vitamin D-3 supplement, calcium iodate, biotin, menadione sodium bisulfite complex (source of Vitamin K activity), sodium selenite.

Purina Pro Plan Select Beef & Barley Formula Guaranteed Analysis

Guaranteed Analysis describes the nutrient content required by AAFCO labeling standards to be identified on every product package. Since these are guarantees, pet food manufacturers work to formulate diets that meet or exceed the minimum requirements.
Crude Protein (Min)27.0 %
Crude Fat (Min)17.0 %
Crude Fiber (Max)4.0 %
Moisture (Max)12.0 %
Linoleic Acid (Min)1.6 %
Calcium (Ca) (Min)1.0 %
Phosphorus (P) (Min)0.9 %
Vitamin A (Min)15,000 IU/kg
Vitamin E (Min)460 IU/kg
Ascorbic Acid** (Min)70 mg/kg
Docosahexaenoic Acid (DHA)** (Min)0.25 %
Eicosapentaenoic Acid (EPA)** (Min)0.25 %
Glucosamine** (Min)550 ppm
Omega-3 Fatty Acids** (Min)0.75 %
Omega-6 Fatty Acids** (Min)1.75 %
**Not recognized as an essential nutrient by the AAFCO Dog Food Nutrient Profiles.

Metabolizable Energy (ME)
4065 kcal/kg
1848 kcal/lb.
455 kcal/cup