The most common scare tactic vets will throw at new puppy owners regarding RAW feeding is that the puppy will not get the proper balance of calcium and phosphorus. The article link below will walk you through the ins and outs of how RAW provides a better balance than commercial foods. This article includes the break down of bone percentages and how to calculate if your dog is getting enough.
https://www.dogsnaturallymagazine.com/bone-food-values-for-raw-feeding-dogs/