How old is your puppy ?
My Pix is 3 months old and home for 3 days only, and I've been through the same until yesterday. She wasn't eating much, boiled chiken, wet or dry food, and I am supplementing with Nutracal. After the check up with the vet, she told me to try Science Diet Puppy small bites, and that made all the difference. The last 24 hours she is eating plenty on her own, and doing just great. She also recommended to start her on dry food if she will take it, to help with teething.