We have in the past with our large and giant breed puppies switched them to adult food at 6 months to slow their growth to prevent hip issues. I can’t remember if we did it back 15 years ago for our first saint or not but she never had a hip issue, and lived to 12 on cheap store bought food.
Currently the GR is on Pro Pack Ultimate Puppy and the other two are on crappy Purina adult food.
The puppy is on the low end of weight from being what we believe to be the runt. The Saint is a great weight of 118lb and the beagle is a perfect 35lbs.
