
I agree with everything dogs a babe has said. Defo go with what the breeeder feeds at the beginning then you may decide to change later. I feed raw and use arden grange as my back up should I need it for both my dogs (GSD and POM x.) My gsd's sister is still on royal canin which is what the breeder used and is very popular. There are lots of others part it does also depend on what suits your dog and your pocket. I would firstly concentrate on finding a good breeder that has the type of pup your like. For example do you wabnt long or shorthair I knew I wanted longhair so concentrated on those breeders. Discover dogs in November is an excellent source of information, otherwise have allok on here and talk to the breeders or through the kennel club.
Sorry if I am teaching you to suck eggs I for some reason assumed this was your first dog and maybe it isn't