So I just went to petflow and was gonna order Chaos first bag of all life stages food, but the decision is sooo hard.Which flavor should I go with? When I got him as a pup we tried the chicken al la veg and I think he had a small allergy to it. Although now he is on fromm gold puppy (pink bag) and it has chicken and he has been ok. I want either salmon, beef frittata or surf and turf....what do u guys think? Also will i have to "transition" him or because its fromm can i just feed it when it arrives?