Do you feed them less after they turn one so they don't get fat? Joel has been eating half a cup a day sometimes a little less but lately he feels like a Shar Pei

when I pet him,lol I can't remember what he weighed when he was just at the vets, but until I take him again to get weighed I used the scale here and it said he was 9 pounds

not sure if it's totaly accurate, but I wouldn't be surprised. So i'm thinking to feed him 1/3 cup instead along with treats and veggies in the middle.