Congratulations on your new puppy! Good for you in wanting to provide a good diet & care for him.
When feeding a large or giant breed, particularly one especially prone to structural development problems, I would exercise extreme caution in diet & exercise/movement restrictions during growth and make that my priority.
French Mastiffs (or Dogue de Bordeaux) have a rate of more than 50% of individuals having hip dysplasia, per the OFA. This is one of the highest of all breeds.
Most of this is genetically inherited, and so much of your risk depends upon the breeder of your puppy & the 4-5 generation pedigree behind him (& their littermates), the percentage OFA’d (or given a similar non-U.S. normal rating).
So I would look for foods like on HDM’s DFA list that have appropriate total calcium & calcium to phosphorous ratios. You also want to carefully avoid over feeding, feed to keep your pup on the skinny side & with frequent weight checks to ensure that your pup does not grow too fast. But I would also recommend to you that you get in touch with breeders of your breed who have been breeding a long time & have had an excellent track record of producing dogs with normal hips & feeding for normal hips. Beyond diet it will be important to take care with the type of exercise and amount — again following successful breeders’ recommendations and researched guidelines.
Good luck and welcome!
