Hi merleGDgirl!
How exciting a new giant puppy! I have two large breed dogs, but didn’t know about this site when they were small pups. Fortunately, their hips and joints seem fine so far at 3 1/2 years old. On this site, the creator and most participating members believe that it is OK to feed puppy food and higher protein to large and giant breed pups. It is the calcium level that is the major concern. Please check out the link that Dog Obsessed provided up above to help with the appropriate calcium levels.
I think that Wellness Core puppy food would be a great choice. It is a fan favorite on this site and better than that your very own sister has had good luck with it. You will probably want to feed your new pup whatever the breeder is feeding it for a while until everything gets settled down. There are already enough changes going on for that pup at first without changing that too!
I wish you well with your new adventure! Let us know how things go!
