I am kind of concerned about my male puppy's growth weight. He was born Oct 3rd 2012 and at the end of 13 weeks our vet weighed him at 55.6 ibs. According to my book he should weigh that until 16 weeks plus. We are getting another set of shots this Saturday and will be weighed again. According to the vet he is not over weight and we are following the food charts for him.