i think i must be a very cruel doggy mummy!
we buy waggs - ( £7.00 for 15kg, on offer at morrisons, or we usually get it from costco ) have done for years, the dogs are fine. good coats, clear eyes etc and lots of energy.
we dont show or work them - they are pets dogs. sometimes they decide they dont fancy the food, or are not in the mood for it. when this happens, we lift the bowls and put them down later. they wont go hungry. we did the same with our daughters when they were little!
we also suppliment with raw chicken wings, rice and gravy and leftovers sometimes.