My puppy just turned 4 months, I changed to adult food because I heard 4 months was the age. But some say never put on puppy food and some say 6 months and some say a year. I have two adult bulldogs that I took them off about 8 months, and they are fine. I just want to do the right thing. He is 30 lbs, He isn't fat. When you take them off the puppy food should I give supplements? I want to do what is best for him. I want him in the best condition, just as if I was going to show him, which I may.