How To Increase Fiber In Dogs Diet. Depending on what your vet tells you about your dog's specific needs, the meal plan should contain increased amounts of either soluble or insoluble fiber. The diet of adult dogs should contain at least 2.5 to 4.5 percent of fiber.
Is too much fiber bad for dogs? 9 health benefits of fiber for dogs. Vegetables are also helpful in establishing a good fiber diet for your dog.