My wife feeds them Nutro Max. I'm sure she does this because some vet or dog trainer recommended it.
When I feed the dogs, I feed the older ones Purina Alpo Prime Cuts in gravy. I'm sure it's not as healthy as the Nutro Max; but it appears to taste better to the dogs, and I figure the old dogs should get whatever they want.
For the most part, dogs don't seem to care what they eat. Last week, two of them attempted to consume my wife's cell phone. I found parts all over the house, and in the back yard. It was awesome.
From each according to his ability, to each according to his need -Karl Marx