I have always been of the opinion that the best food is what the dog does best on. I have had 5 GSD's and tried many foods until I found what was the correct food for that dog. I had 4 GSD's at once and fed three different foods.
Val da Tiger
Fuzzybutt the cat.
Neilla the Big White puppy.
RIP Cheyenne - AKA: Digger, CheyChey Girl, Cheyenne Large and In charge. 2/16/02 - 2/27/16
RIP Raya - AKA: Raz-a, Ray a Sunshine, RayBestos, the little one, Silly Girl. 9/21/05 - 6/27/14
RIP Lakota - AKA: Bubba, Big Boy, BooBoo (the other part of the Binky and BooBoo team). 1/19/03-9/19/2011
RIP DeeDee - AKA: DD Poo, Little Bit, Binky (part of the Binky and Booboo team) 6/23/02-6/20/11