NO, that's about as simple as I can put it.
Rotties don't quit growing until they are at least 2 yrs old. That's not always 100% but my Jake is almost 4 and bless his heart had a growth spert lately and is way too big.
You don't want your Rottie to be FAT, it's extremely hard on them since they are prone to hip dysplasia and torn cruciate ligaments. Pano is not uncommon in Rotties from what I've read. Jake had it but my vet said he believed that Pano could be a prelude to worse things.
I don't know what you are feeding, but if you are feeding a puppy food for large breeds, then it should have the right balance of nutrients, fats, etc. to help with proper growth but not the fat content that can cause problems later.
I believe that you should not feed them adult food to cut down on fat and calories and deprive them of the essential nutrients to grow strong bones and aid body developement.
I hope you get more responses to this question as I would like to see what others have to say. Good luck with your puppy and we love to see pictures.
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PHRottn
HRottn@PetHobbyist.com" target="_blank">My Email