The rescue GSD I recently took on was on Bakers
Adult. For an eight month old pup from working lines

HYPER!! Might as well give her Haribo!
I put her on Orijen Large Breed Puppy food - no grains or fillers, good quality etc BUT boy did she poop! Even though I was feeding her the right amount she'd sh*t for England - I'm talking 4 HUGE poos before 2pm

My friends even commented on the size of them

2 poo bags to fit one in, sorry if TMI...
Switched her to raw, the same as my other GSD, and such a difference - she smells less doggy, less pooing, is putting on muscle and she's more calm. Result.