I wouldn't change him to adult food. As we all know this breed is a puppy until 3 years of age. Every professional I have spoken to states they need to stay on puppy food until they are at least 2.5 years old because they are still growing and developing all the way up until they are 3. But I do agree with taking him to a vet for his legs. They have tendency to get hip dysplasia.
Just an fyi...I feed my girl Natural Large Breed Puppy Food.
Dude....don't drink the coolaid k?
Seriousy, spend some time looking at the differences between the adult and puppy formulas. In the large majority of the cases there's very very little differences between the adult and puppy formulas. Like, 1 percentage point if that much. There are exceptions, but even then.....
The only reason there's "puppy formula's" at all is because there's slightly tighter restrictions on the nutrients expected to be in puppy food, while a wider range is acceptable in adult foods. But most adult formulas, at least among the halfway decent brands, are all within the the acceptable ranges for ALL dogs.
I can't count the number of vet's who've insisted that you have to feed puppy food because the puppy foods have "higher nutrient levels", but I have yet to have ONE who can quote me WHAT those "higher nutrient levels" should be, and I've had more than one turn speachless when I start pulling up puppy and adult formula information and prove to them that not only is there so little difference between formulas, in MANY cases the puppy formula's have LOWER levels of a HUGE list of nutrients. Never mind the HUGE range of acceptable nutrient levels, even within the puppy requirements, means that those statements are total BS.
I've been quoted other vets who insisted that "high fat levels are needed for bone growth!!!" which if you know ANYTHING about nutrition should have wanting to pound your head into a wall.
We had a member come on here and tell us his vet insisted his 4month old 70+lb EM puppy should only be getting, on average, 700-800 calories a day! The ACTUAL number his dog should be getting? An "on average" number of 1700 or more!
Unless your vet is ALSO a vet nutritionist they very likely haven't got a single CLUE as to the actual nutritional requirements of your dog....