It is VERY confusing, I had poor Vegas on Iams Pro-biotics, until I found this site, the reason I found this site I was googleing because he was having so many issues with red face, itching, STINKING, ear infection. It was a blessing to have found this site and get the information to get him straightened around, It did not happen over night, food was trial and error at first, but with all the good advice I finally found the right food and what a HUGE difference it has made in him. He is happy and so am I !!. You also have to be careful with treats, I was feeding him pure junk on his treats. Lola is getting what she needs unless she is not allergic to grains, Vegas is. I would think you will have to have them on different foods anyways one for adult and one for puppy? There are far more educated people on this site than me on foods, you will get the right answers but again it is trial and error. Good Luck!