So im getting to the bottom half of Gizmo's bag of puppy food, which got me thinking. When i do switch him to an adult formula, do i give him just regular adult/medium or do i go with small breed? what is the difference between the two? we havent weighed him recently, but i would guess he is no more then 10-12lbs (and 8.5 months old), probably closer to the 10. the breeder said he would be a small one. i dont know if this makes a difference in it, but we feed him Blue Buffalo.