So he had his next set of puppy shots today an d is really sore and whiney. He weighed in at 5.8 lbs. Does that seem a little small? He is projected to be 15" (he is a mini) so he will be on the bigger side of minis. I am thinking of increasing his food. I don't have anything to compare him to since my other mini was 1 when I got her. He was 4.8 lbs 3 weeks ago so he gained a little. Does he need to gain faster?