Hi, I recently got my first GSD pup. He is a pure breed both parents being over 70 lbs. he was the runt of the litter and his litter mates were also very small. I got him at 7 weeks and he weight just over 4 lbs! I was informed his litter were dewormed very late due to this pandemic. I took him to the vet, they said he slightly underweight but apart from that that he is very healthy. He has had 2 sets of vaccines and dewormed twice. I was told to increase food by 25% but he just won’t eat the puppy food I’ve tried to add meat but he still won’t pick up his food consumption. I really hope he grows to avg size and weight. I’m wondering if anybody can try and tell me what they predict with his size and maybe why he isn’t eating. Any help will be appreciated and pictures too if that helps. I just hope he will pick up in size and weight. Thank you.