hi sunny, my first dobe came to me in 1979 as the scarecrow lol, i was 19 yrs old and he was 9 months old,weighing barely 76lbs, 26" tall,with one ear up and one down, very thin, bony and roach backed looking, he was an unruly brat, but with a heart of pure gold! i had first seen him as a stocky 5month old pup weighing a solid 55lbs at one of my puppy obedience training classes then he spent the next few months in his owners garage because they chose not to be "cruel"(ha ha) and crate him.so instead he ate the house and garage daily and got no excersize because if he got off the leash he was goneee like the windd. i heard about a "crazy" doberman needing a new home thru the grape vine and went and got my very first doberman pinscher, Smoke,
who became the love of my live and best friend for the next 10 yrs. he grew to 29" 1/2" tall, weighed 109lbs of awesome dobie muscle. i switched him to purina puppy chow and 24/7 free roaming on 100+ acres. all that dog did was run for a solid week before he figured out he was permanently outta "jail" lol
over the next 8 years we trained on to become DESANTI"S
"Sir Smokey of the Springs f.d." C.D. Bh WH AD ScHA ScH1. he could have gone on and on but i puttered out, not him. he died at 10 1/2 years old, quietly drifted off to sleep the day after we came home from a fun match watching a couple of his kids kickin butt, taking the old mans place and making us all proud!
so, now that you know smoke's story , my answer to you would be a good solid high protein high fat food(dogs thrive on as much as 50% fat in their diet) and as much exercise as humanly possible and watch the growth spurts start them muscles poppin!