Feeding Your Puppy: A First-Year Timeline.
Sometime during this period, decrease feedings from four to three a day. A pup should be losing her potbelly and pudginess by 12 weeks. If she is still roly-poly at this age, continue to feed puppy-size portions until body type matures.
Begin feeding twice daily. Spaying or neutering lowers energy requirements slightly; after the procedure, switch from nutrient-rich puppy food to adult maintenance food. Small breeds can make the switch at 7 to 9 months; bigger breeds at 12, 13, even 14 months. Err on the side of caution: Better to be on puppy food a little too long than not long enough.
Most owners feed adult dogs two half-portions a day