Hi RollTide10-
You are correct, at 2 years old your mix breed is capable of regulating his calcium uptake now and no longer requires a large breed puppy diet or for you to be concerned about the ratio of calcium and phosphorus. He can now be placed on an adult maintenance diet or all life stages formula. Most importantly now is keeping him lean (4/9 on BCS).
As far as foods go, it sounds like he was doing much better on Royal Canin, so if I were you I would put him back on that since it was already established that he was doing well. Itching his back a little bit is not an indication of allergies. Dogs get little itches just like we do, doesn’t mean we are having an allergic reaction and same is true for them. However with WEF it does sound as though, either the source of the Omega 3s is not as quality of a source as with Royal Canin or its not enough. BTW, as an aside, ingredient lists tell you nothing about the quality of a food, only what should be in it. Royal Canin has strict sourcing and has often denied shipments of corn that Kelloggs then buys from them for our cereal. So I would not worry about their ingredients being of poor quality.
