no the proportions are the same no matter the breed. just the total amount fed is smaller for smaller dogs. you want to feed 2-3% of the dogs ideal weight daily. So, for a 9lb dog with average metabolism, you would feed just under 2/10s of a lb daily or about 3 ounces. then you raise or lower the amount you feed based on how the dog is doing on that amount. So, the 9lb dog would need 2.5 ounces of muscle meat, .32 ounces of bone, and .32 ounces of offal if you feed the 80/10/10 prey model.
On the other hand, my 78lb GSD would eat 2.34 lbs of food a day.
So, you would need a lot less freezer space simply because you would need less meat. Depending on your area, raw can be cheap or expensive. When I lived in WV in a farming and hunting community, it generally cost me $10 a month to feed 2 80lb dogs. Here, it would cost me $70 a month to feed 1 dog.