She is 35lbs and she is starting to look too boney. O know the breed is slim but she is definitely on the low weight side. She was the runt of a litter of 10 puppies. She has not had her first heat yet. I feed her about 5 cups a day of PPP puppy large bread. I do exercise her properly for her age and bread (twice a day and the early walk about 1.5 hrs and 4 miles approximately). Any advise is appreciated.