Wheat Gluten

Wheat starch plants mix flour with water and separate the starch for sale. Gluten proteins gather during washing, then are collected and dried. The process gives manufacturers another saleable product from the same flour.^7,8,9

1. 01 // Source Wheat flour Milled flour enters a wheat starch plant, where its starch and proteins are separated.
2. 02 // Process Mixed with water Water hydrates the flour, allowing gluten proteins to gather into a stretchy mass.
3. 03 // Process Starch washed away Washing carries starch into a separate stream while the gathered gluten is collected.
4. 04 // Process Dried and ground The wet gluten is dried to preserve its binding properties, then ground into powder.
5. 05 // Output Wheat gluten powder A dry protein concentrate reaches the kibble plant with little starch or fiber.

1. 01

   Raises the protein content

   Washing removes most starch, leaving a concentrated protein powder. It raises the crude protein figure and supplies amino acids dogs digest, provided the full recipe balances its low lysine.^1,8

2. 02

   Helps hold dough together

   Gluten proteins form an elastic network when hydrated. That binding property gives manufacturers another way to manage a recipe's texture before it becomes kibble.⁷

3. 03

   Uses the starch stream

   Starch production already separates gluten from wheat flour. Selling the dried protein gives processors a use for that stream and pet food makers a concentrated protein ingredient.^7,8,9

How much A controlled dog trial fed wheat gluten at 8.81% of a complete diet; that tested amount is not a typical recipe amount.⁴

1. Brands say

   Dogs digest wheat gluten well

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   Controlled comparisons in 12 Beagles, 27 other dogs and 8 French Bulldogs found good protein digestibility from wheat gluten diets. Digestibility is a strength, though it does not fix gluten's low lysine content.^1,2,3,8

2. Brands say

   Wheat gluten makes stools firmer

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   A 27-dog trial found better stool quality with wheat gluten than poultry meal. An 8-dog comparison found no stool score difference among wheat gluten and poultry meal diets. The result depends on the full recipe.^2,3

3. Vets say

   Wheat can trigger food allergy

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   A review found wheat reactions in 38 of 297 dogs with identified food triggers. Those dogs were selected for food reactions, so the figure is not the risk for all dogs or a separate rate for purified gluten.⁶

4. Critics say

   Wheat gluten is just protein filler

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   It averages 85% crude protein on a dry matter basis, and the wheat gluten diet had the highest protein digestibility in a 12-Beagle comparison. The fair concern is its low lysine, which the full recipe must balance.^1,8

5. Owners say

   Gluten harms every dog's gut

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   In affected Irish Setters, intestinal changes resolved when gluten was removed and returned after a gluten challenge. That demonstrates a condition in susceptible dogs, not general gut harm; controlled feeding trials found wheat gluten diets well tolerated.^1,5