Hey
I would try your Puppy on Sweet potatoe and small bit off Goats natural Cheeses. My Sister Yorkie loves it when she gets a sore tummy or with not eat.
Just cook the sweet potatoe in the mircowave for 10mins pick it with a fork first. and then put a small bit of Goats cheeses thou it.
I hope this with help.
Let me know
Caz