I'd switch to Diamond's regular puppy food with higher protein and fat if I were concerned. I'd use the recommended method of blending in the new food in 25% increments for a period of three days as well. Pointers aren't large breed dogs and aren't plagued with some of the growth problems the larger breeds frequently have. Pointers do generally have higher activity levels than large breeds which might require more calories.

You still haven't commented on the physical condition of your pup. Can you see his ribs? Does he have some muscle? Energy level? Does he appear thin, normal, heavy?

Like Doc said his eventual size is already determined, what you need to be concerned with is his current physical condition.