Even if they do eat the stomach contents first, what do they eat second? The soyrizo wrap the prey was clutching in it's paws? Low quality dog food isn't a reason to feed a dog vegan food, it's a reason to feed it, you know, quality food.

There should be a law against feeding cats or dogs vegan diets. And children.

(And I'm pro small government - I don't like having laws for the sake of them...).

Dogs eat poop, whadda they know?

They eat grass when they're constipated. They like a little roughage now and then. Moose eat lilypads and waterfoil and stuff, and browse tree buds and cedar fonds, etc. Sounds like good roughage to me.

Even so, I doubt wolves prefer the belly contents very often. They probably like tripe, so the stomach meat gets favored for that reason.

Taken from http://rawfed.com/myths/stomachcontents.html

Wolves do NOT eat the stomach contents of their prey. Only if the prey is small enough (like the size of a rabbit) will they eat the stomach contents, which just happen to get consumed along with the entire animal. Otherwise, wolves will shake out the stomach contents of their large herbivorous prey before sometimes eating the stomach wall. The following quotations are taken from L. David Mech's 2003 book Wolves: Behavior, Ecology, and Conservation. Mech (and the others who contributed to this book) is considered the world's leading wolf biologist, and this book is a compilation of 350 collective years of research, experiments, and careful field observations. These quotes are taken from chapter 4, The Wolf as a Carnivore. "Wolves usually tear into the body cavity of large prey and...consume the larger internal organs, such as lungs, heart, and liver. The large rumen [, which is one of the main stomach chambers in large ruminant herbivores,]...is usually punctured during removal and its contents spilled. The vegetation in the intestinal tract is of no interest to the wolves, but the stomach lining and intestinal wall are consumed, and their contents further strewn about the kill site." (pg.123, emphasis added)

"To grow and maintain their own bodies, wolves need to ingest all the major parts of their herbivorous prey, except the plants in the digestive system." (pg.124, emphasis added).

This next quote can be found on the Hunting and Meals page at Kerwood Wildlife Education Center. "The wolf's diet consists mostly of muscle meat and fatty tissue from various animals. Heart, lung, liver, and other internal organs are eaten. Bones are crushed to get at the marrow, and bone fragments are eaten as well. Even hair and skin are sometimes consumed. The only part consistently ignored is the stomach and its contents. Although some vegetable matter is taken separately, particularly berries, Canis lupus doesn't seem to digest them very well."

So this is taken from wolf experts.

Wolves and other mammalian carnivores don't eat the stomach because the food is poorly digested at that point, and furthermore is highly acidic (thus dangerous for the pharynx/exophagus). What isn't mentioned in these responses is the bowel. My understanding is that the bowel is consumed somewhat universally among mammalian carnivores because it contains plant-based breakdown products carnivores don't have the enzymes to break down themselves, and cannot get entirely from meat.

Carnivores have digestive tracts too short to properly break down most plant foods, which is the reason for consuming offal (including bowel). Stomach makes no evolutionary sense to eat, because its contents have only minimally been digested, and would likely still cause gastrointestinal upset in the short carnivorous digestive tract.

But there is no physiological, reasonable, nor ethical reason to feed carnivores an herbivorous diet. It is in fact pathological, irrational, and unethical to do so. For commercial evidence of the physiologic facts, look at high-quality dog/cat foods: increased animal content and decreased vegetable (especially grain) content.