What does the breeder raise the pup she keeps back on? What food does she feed her adult dogs? She may know from experience that some food others recommend may not suit her breed, or they do better on a certain type of food. Do her adult/youngsters look well and healthy?
What is
best is what suits your puppy, if doing well on Eukanuba then carry on with it, certainly until the puppy has settled well with you. Lots of chopping and changing can upset the tummy and make for a fussy eater. Personally I prefere Arden Grange to Eukanuba, and not just because its cheaper

but I prefere whats in the sack.
I have bought a good supply of the puppy food but when she gets older is dry food sufficient?If shes doing well, then yes, a good quality complete should do the job. But there are lots of people on here that can advise re raw feeding.