Can anyone give me advice on what is best to feed my GSD puppy of 8 weeks? I have had conflicting advice from the breeder and the vet. 

Were you happy with the puppy's dam and any other dogs the breeder owned?

I guess so , but whether they were fed the smae. I don't k now.

I'm sure they would have been, why wouldn't they?  I can't see a breeder not sending a puppy away with the best advise they know and that is surely going to be what has been tried and tested on their own dogs :)  If you are not sure why not ask her?

Hi did the Breeder give you  a detailed diet sheet showing exactly what you have  to feed the dog on and the general care involved. With looking after a new pup.?

The breeder will have told you what your puppy's been fed on so far. Stick with that for at least 2 weeks before you think about changing. What did the breeder feed, and what does the vet suggest?

Visit this site below,it should give you a lot of information
on your breed

http://www.gsdsrus.freeserve.co.uk/articles.html