I hate to admit, and if I'm gonna do it, this is the place....but I have pretty much sampled what I feed my GSD.
Funny story, but true. Had another arguement with my wife about what the dog gets to eat. After 14 years and with my second GSD, I am dealing with allergies for the first time. First step was to immediately narrow the scope of her diet, followed by treating the symptoms...meds, soak in a tub of warm water, and a topical antibiotic for the spot or two that required it. Wednesday I come in and Dayna had just scarfed something down...I could tell....you know that look and the lip licking?? So in a voice of authority.."what did the dog just eat?"....and the answer comes back, "corn dogs the kids didn't finish".
Needless to say, I was upset....she has been on a restriced diet for a week, the spots where she had irritation have all cleared up, and the symptomatic scratching has subsided, so we feed her corn dogs! My well though out response was, "you cannot feed this

to my dog!", to which she pointed out, in a very angry tone, "that is what I feed your children". Allow me to point out that she and I have had this discussion before under less strained conditions....but I've just turned a corner in a very short time addressing my dog's issue, and she fed her CORN!!!
So yah, I taste what I feed my dog, with the exception of corn dogs, I wouldn't eat that crap.