Hi Nick-
I’m not familiar with Advantage. Could you mean Authority?
A 9 months old your pup’s ability to regulate calcium is starting to mature. She still is not fully able to regulate it, but she is past the critical growth period at least. I’d still recommend finding out the average or MAX calcium and phosphorus and using the calcium calculator on this site to make sure it’s safe to feed. If the company is difficult to contact or unwilling to give you a nutrient analysis on their large breed puppy formula, I’d go with another food.
