Got to page 5976 and got bored, so I skipped to the end to add my own thoughts.

We tried our SBT on a huge variety of dried food in the first few months we had him. He'd been on a diet of chicken, rice, scrambled egg, tuna, and cheese at the breeders so it was a gradual and very expensive first few weeks - getting him used to eating what I would call "dog food".
We discovered that:

Bakers gave him spots/lumps

Pedigree of all types made his poo runny and stinky.

Iams didn't interest him at all, and Science Diet, James Wellbeloved, Eukanuba, Royal Canin, Purina, etc etc etc all gave him the squirts/dandruff/spots/skin problems/itching/etc etc etc.

We tried them all, and in a moment of exasperation and cheapness bought him a small bag of Morrisons My Dog.

Ingredients as follows :

Don't know - 100%

Dog likes it, eats it, is fit and healthy, and has none of the symptoms the other foods gave him, so.........

Before anyone jumps down my throat and calls me irresponsible for feeding my dog meat flavoured cardboard - it doesn't matter.

Each to their own, each dog will do well on a certain food and poorly on others, so try them all and decide for yourself.

BTW I've just started making dog food from ground chicken necks and meat 'leftovers' from the butcher, cabbage, carrots, potatoes, parsnips, porridge oats, tuna, cheese, and goats milk. Not all at once of course, and I'm still experimenting, but both my dogs eat everything I give them and aren't showing any signs of ill health, weakness, or dandruff (which one of them was starting to get) and the female is putting on weight at a good rate after giving birth to 7 puppies 6 weeks ago.

I'd better get off to the raw food forum.