I started feeding my mini blue buffalo...and his stools were relatively firm and dry, but they have gotten progressively softer/watery. He doesn't have full-on explosive diarrhea...but I don't know what could have caused it ...he seemed fine with blue initially, but a little gassy..and i don't see any worms or anything. should i put him back on iams?? i'm skeptical to start feeding him human food just in case he never wants to go back to dog food. what should i do??? should i put him on a new dog food or wait it out to see if his stomach re-adjusts?