Hi are you asking about a raw feed breeder because you are looking for advice about raw feeding your GSD or because of something else.? I saw from your previous post you dog has severe allergies. I am not sure how old he/she is.
I raw feed my two girls who are a bit smaller than your dog they are Shih Tzu’s. I have raw fed them for several years and can honestly say the best thing I ever did for them. I did recently try them with a cold pressed food but hasn’t worked out.
If it is advice you are looking for I would suggest that you speak to one of the suppliers. Although I have never used them myself I have heard a lot of very good things about The Dog’s Butcher in Newton Abbot and her website is full of very useful information. I tend to buy ‘completes’ from Wolf Tucker.
In my opinion I think raw maybe the answer to looking for food to help with your dogs allergies.