Suresh,
The highest quality dog foods and best companies take great care not to include those nasty ingredients. The key is finding a company/brand you believe in and can trust.
Looking at a company’s history, verifying the quality of main ingredients/sourcing on the the label, quality control checks, etc. will help reassure you about the food you select. If they aren’t forthcoming with answers and sympathetic, eager to help (although with the really small companies this can take time to get back to you with answers), or are evasive & vague or deceptive, or you don’t like the answers, walk away & find another brand.
Re vegetarian diets, if they are *vegetarian* as opposed to vegan, it is possible for them to be every bit as high quality, digestible, nutrient rich and health promoting as meat based. Organic free range natural vegetarian fed eggs, organic yogurt with live cultures, cottage cheese are all very good primary protein sources for dogs. You can do this with homemade. I’ve not been very impressed with commercially prepared, generally vegan (not merely vegetarian), kibbles and canned foods and I am pretty familiar with the options out there. Other new ones are insanely expensive. So while it is theoretically possible to make a very good vegetarian commercial kibble, it doesn’t seem to be readily available.
Not vegetarian, but more acceptable to many vegetarians, in that it is not cruelly factory farmed, fed unnatural weird things, and one of the least contaminated flesh foods out there is sardines. All are wild, live near the bottom of the food chain and so are not contaminated like other larger & longer lived predator fish, super high Omega 3 brain food also great for skin & coat, perfectly balanced calcium-phosphorous & soft easily digestible bones. Sardines are probably one of the very best non-vegetarian foods a dog could eat, and, to my mind, waaaay superior to the more popular-with-humans chicken based food.
Vegan is doable in dogs but riskier and harder, needs a good supplement including things like B12, l-carnitine, taurine, Omega 3. The easy part is supplying the amino acids through an array of foods, as the body does not distinguish between the same amino acid from one food versus another. In terms of nutrients (not natural preferences or digestive system), dogs are more omnivorous vs obligate carnivores, cats. The hard part is that many plant foods are not easily digested by dogs, whose systems are not designed for them. Many beans and whole grains (non whole grains, like white rice, are easily digested but high sugar) are next to impossible for dogs to digest, no matter how well cooked & prepared. Some breeds, like GSDs, are even less capable as a group of digesting than other breeds. Unlike whole soybeans, tofu IS very digestible; many dogs like it; it’s very versatile in how it can be prepared; and it offers various health benefits. It is healing to the stomach lining, for example. On the other hand, a prominent very balanced study of vegetarian fed pets showed that pets fed vegetarian diets without soy had much better health and longevity. From personal experience and knowledge of dogs eating vegetarian diets, lentils and black eyed peas seem to be more easily digested. It can be hard to supply enough calories and avoid too much fiber. Dogs can consume up to 50% fat in their diets in good health though, and vegetarian fats like organic virgin coconut oil are good for them & easily digested. Vegetarian diets, in humans and dogs, tend to be excessively high in Omega 6 fats which are pro-inflammatory and deficient in Omega 3.
Certain breeds like boxers and dobermans are at much greater health risk on a vegetarian or vegan diet, due to high breed susceptibility to deadly cardiomyopathy.
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