I think, if your dogs are doing well on what you are feeding them, then ignore that link.
My two (age 1 & 8 months ) get a mixture of puppy & adult foods. For no other reason then they wont eat the same food over and over again. At the start I went through a few different foods with Cava, as she is more fussy but i think she was just holding out for a treat.
I was recently told by a member of my family that Cava was underweight and i was asked was i feeding her enough. I was more then hurt at the accusation as you can imagine, i do nothing but love and care for the doggies! Cava went to the vet later in the month for spaying and i asked the professional her advice, she told me that Cava was the perfect weight for her size & age.
If you are truly worried, i say nip into your vet, or give them a quick buzz, they will be more then happy to help you out and put your mind at ease.
owned by Cava a Tri Color, age 1 & Spud a Blenheim, age 8 months