All types of rice and even rice flour are considered to be safe forms of grains to consume for those with a sensitivity to the protein. (agymrat.com)
This doesn't say «ground wheat» or «ground corn» or other forms of grains which might be easier for a dog to digest. (dogfoodinsider.com)
On Passover the only form of the grains that can be eaten is in the form of matzah, which is made through a careful process to prevent leavening. (couldntbeparve.com)