Hi Martin G-
I’m thinking that a German Rottweiler is a large breed, isn’t it? If he’ll be over 50 pounds, then yes.
Here is a helpful article for keeping large breed pups joints healthy:
/best-dog-foods/best-large-breed-puppy-food/
It is important to keep them thin and lean. But, if your vet thinks he’s too thin, then he probably is because most vets prefer dogs on the lean side. So you can check the calories per cup on the bag and choose a food with higher calories, or just feed him more. You could even add more canned food to his meals as long as it is a complete and balanced recipe that you are adding.
What a lucky puppy that gets to have an acre back yard to run in! Have fun and good luck!
