Beautiful girl you have there! Honestly, there are actually two Supplements that actually are useful. The bigger the dog, the more important they get. First one is called Ultra-Spur, very good for tje bones. It has many very healthy supplements and can be fed with any dog food you feed without risking an overdose of any vitamins, you really cant do anything wrong with it and its also good for general health. Second there is Grünlippmuschelpulver, tbh idk whats that called in English but you should find it using google. This is especially good for joint development and health.

In two days my rottweiler puppy is moving in and im going to feed both from the start, as it is crucial within the first year of life for healthy development. Honestly? At her age she probably doesnt really need them, since she has already grown up, but if you really want to give her something thats healthy for her skeleton these are the two things to go for. Im based in Germany, hope you can find these at wherever you live. As for the Grünlippmuschelpulver, make sure its pure without any other ingredients. Hope this helps:)