Okay, I am no vet or breeder. But, I have a 5 mo. old. Some say to change to adult food when pups turn 6 mos. A petsmart clerk just told me yesterday that they need the puppy food nutrition until they are 1 yr. old. Who to believe? Let me add I feed him the best....I just want to know when to switch. Also, does planning to neuter him @ 6 mos. or so make a difference? Logic tells me neutering him obligates switching to adult food. All you experts out there, HELP!!!!