My 9 week old pup doesn't seem to want to eat. Shes smaller than her littermates who all have very hearty appetites like their mum who is very greedy! She is fed on a completel puppy food as she always has ben. Shes never been a brlliant eater ever since she was weaned but when i put the food down she is interested has a couple of biscuits and then walks away. she doesn't seem very interested in treats and things. I've always had dog that love food and so clicker training has been easy but i'm a bit concerned by this! The vet says she healthy. Is this normal?

Try soaking the biscuits first with hot (not boiling) water and letting it cool till it's nicely warm and a bit mushy, having recently left her mum and litter she could want the comfort of warm, soft food - bless! :-D 

She is still be settling in with you and everything is a bit overwhelming for her ;)  she may seem confident and grown up but she is still a very young baby puppy ;) 

Was she wormed regularly from 2 or 3 weeks?  with a Veterinary wormer - not a petshop one?   If not she may need worming to ;)

Just a thought but is she having EXACTLY the same food as she had with her breeder?  Same brand and variety?  At this age she will need to stay on what she had before you had her ;)