By your definition cats are also omnivores since they do eat grass. But they're not omnivores. Blurring the line is fine but at the end of the day it's accepted fact that dogs are carnivores... Not by assumption but by empirical evidence.

The evidence is actually the other way around. This is the part that we used to believe true. Even the Aggies call them Omnivores. Here is a short article about cats being carnivores- http://vetmed.tamu.edu/news/pet-talk/low-carb-for-cats/
About mid page she calls dogs omnivores.

http://dels-old.nas.edu/banr/briefs/...tion_final.pdf -Another good read about dog nutrition all together.

Dogs have the digestive tract and enzymes to break down the cell walls in plants. Again they are not as efficient of doing so as a herbivore but no omnivore is nor will they ever be. When a animal can specialize their diet the body becomes more efficient at breaking down the food source. The problem in doing so is, if you specialize in one food source- Let's say rabbit, then all the rabbits become extinct so do you unless you can adapt. This is why omnivores have better chances of survival if a food source is depleted. Now Im on another tangent. lol Ok also a little known deer fact- We lose a lot of deer each year when hunting season comes along, not because of hunters but because of the corn used. The deer go from eating forbes throughout the year to the corn which the hunters use in the feeders. Their digestive system has to adapt to the massive amounts of corn they eat that even though they are full they cannot get enough nutrition from this that some will actually starve to death.

Back to the raw diet, I think it is good but would still supplement vitamins and minerals.