Particularly low grade, highly contentious or excessively vague ingredient we usually recommend avoiding
Wheat feed in dog food
Although finding a strict definition is quite difficult, wheat feed appears to be the general term used for wheat that does not meet meet the standards necessary for human consumption. It is therefore only suitable for animal feed - usually for farm animals like horses, cows and pigs.
Since wheat is widely regarded as a problematic ingredient for dogs and since this is the dregs of the wheat industry, wheat feed is certainly well worth avoiding.