My pup is almost 12 months and I am going to switch him to adult food. I tried the Fromm's LB Puppy when he was young but it gave him loose stool and I switched him to Diamond Naturals LB Puppy. He's done well on it. Should I assume the adult Fromm would have the same effect? I'd like to feed him a decent kibble in the ~$50 range for the large bag. Thanks!