WOOOOOAH.....
A lot of advice here that can spell diaster for some dogs.
Several are quoting % to feed but if I understand correctly you have a growing puppy - if so, your puppy has very different requirements and a much higher calcium need right now. 2 - 2.5% may work for adults, but not growing giant breed dogs.
Case in point: a 6 month old puppy has 3 times the calcium requirement of an adult dog and almost double the zinc requirement
When I started feeding raw, I started with the % guideline and just feeding a ton of variety. I didn't have any disasters, but I also didn't have great improvement or results and found deficiencies over time. Years later, a lot of schooling, and now doing this for a living I can say that few dogs, especially giant breeds, do well with such a wing it approach. Dogs do best when fed the proper number of calories, just as we do, rather than a % of food, which means nothing. Imagine if we ate 1% of our body weight every day - 1% of what? 1% of sweets and breads? Or 1% of nothing but protein? A big difference in calories and fat level and a big difference in nutrition. A 100 lb adult dog that is moderately active requires more than 1,400 calories a day for example.
Calcium and Phosphorus balance is important as has been mentioned, but so are a lot of others. Many raw feeders feed far too much bone - thereby feeding an excess of calcium. Excess calcium will inhibit the absorption of magnesium and zinc. Dark colored dogs like Berners and Newfies start showing red tinged coats from these deficiencies and raw feeders dont know why. This is just one example and I am one who agrees with a previous poster - it isn't rocket science, but it does require some math to ensure you understand the dog's nutrient requirements.
I highly recommend some reading before jumping in at a minimum. Even better, work with a canine nutritionist or diet expert who can at least start you on a balanced diet, and from which you can evolve variety.
Kymythy Schultz' Natural Nutrition for Dogs and Cats is great for understanding biologically appropriate foods to feed.
Monica Segal's K9 Kitchen and Optimal Nutrition are great for understanding how to meet the nutrient needs and reasonably balance the diet.