I'm not a fan of vegan or vegetarian dog foods, and the science is so terribly flawed (read this), but I find V-Dog dog food comes across the best of the ...
This vegan food is predominantly corn, soya, and rice. Is it a good dry food to feed your dog? No, not really.
Cereal grains for dogs isn't an appropriate canine diet, even if you do choose for your dog to be vegan