Some lovely questions there
To save me writing a book, so far as arguments go, there are plenty on either side and really the best is to read them all (until you get fed up) and apply your own common sense. The first question to ask oneself is always "is there a profit motive here?" which filters out a lot of mischief but not all of it. No diet is perfect, and no one diet suits every dog. I feed raw because:
My dogs look and function better than ever they did on commercial food (they are working dogs)
They heal faster from injuries
They stay healthy into old age
Their teeth are awesomely clean
They love the food (they are not foody dogs, apart from the terrier)
Puppies wean earlier and are very forward developmentally
Dogs are calm and receptive to training
Once we get into the swing of raw feeding (an extra freezer, some forward planning) it isn't time-consuming though obviously takes a little longer than swinging a cup in and out of a sack.
If one of your dogs throws up or won't eat a certain food - that is the dog telling you the food doesn't suit. None of my dogs will eat turkey, which I suspect tells me more about turkey farming than I should ever want to know. If your prepared turkey mix has bone shards, I'd not buy that again.
Chicken feet will make great feeding and remember dogs get a lot more nutrition out of gristle and connective tissue than we do (also worth remembering that THIS the type of chicken in the cheaper dog foods).
You can overdo the eggs, so limit them as suggested.
Commercial dog food started with Charles Spratt just over 100 years ago, and was (as has never changed) leftovers from the human food industry, in this case ship's biscuit and beef broth (the 'beef' was more likely horse). Dogs eat better now than they ever did, because only recently have we been able to afford to give dogs meat. Before then, the only meat most dogs got was when they hunted and killed it themselves, and managed to gulp it down before another dog or person found out. This is one reason dogs are so much healthier nowadays - which commercial dog food makers puff is all about their food being better for dogs than table scraps (in the days when not much food got left over). But going back to real food is a move a lot of us are making, for ourselves and our dependents. How many people do we know who feed their babies glop out of a jar?
and if they read the ingredients in that glop.....
I feel your pain over the fish water. I do things like that quite often. *sigh*