As regular readers of my newsletter know, one of my goals is to steer pet owners away from commercially available dog and cat foods with added fiber.
Fiber in pet food often comes from grains and other undesirable sources, and there's usually way too much of it added to the ingredient mixture. Your carnivorous dog or cat has no biological requirement for food high in fiber, or for grains and other starches.
I find it disingenuous at best of the pet food industry to try to position the addition of inexpensive fiber fillers in dog and cat food formulas as 'beneficial' to pets.
Read The Truth About Dietary Fiber and Prebiotics in Pet Food