Usually they will barf up any pieces of bone they can't digest.
As far as balance goes, once you are well into your feeding regiment, you can use a balance over time type of method. Your dog doesn't need every nutrient in every meal. As long as they get what they need in a rotation, it will work. For example, I feed mine fish only about 1 or 2 times a month. I give them liver by taking out a package, feeding them a small amount every day until it's gone, then they don't get it for a week or 2. Because Bruzer only gets a small meal each day, I often rotate him between a bony meal one day and a meaty meal the next, where the big dogs will get some of each every day. Rotate your bone sources and your muscle meats. It's really not as complex as people think once you get going.
As far as how much Jack has to eat- you can't go by what the company says. You have to gauge your dog and weigh in factors like his metabolism, activity level, etc. I'd think feeding premade raw for a big dog like Jack would be horribly expensive. If I had no one to feed but Bruzer, then I might use the convenience of premade, but when you are going thru 5-6lbs of food a day, that would be way too expensive. For a while, when Daisy was around 100lbs and still growing, she was getting 5lbs of food a day to try and keep up with her growth. Now she's full grown and her metabolsm has slowed, but not her activity level, but I can feed her 3 to 3.5lbs a day now and she maintains her weight nicely. Gunnar can get 2-2.5lbs, and Bruzer gets about .5lb.
As far as balance goes, once you are well into your feeding regiment, you can use a balance over time type of method. Your dog doesn't need every nutrient in every meal. As long as they get what they need in a rotation, it will work. For example, I feed mine fish only about 1 or 2 times a month. I give them liver by taking out a package, feeding them a small amount every day until it's gone, then they don't get it for a week or 2. Because Bruzer only gets a small meal each day, I often rotate him between a bony meal one day and a meaty meal the next, where the big dogs will get some of each every day. Rotate your bone sources and your muscle meats. It's really not as complex as people think once you get going.
As far as how much Jack has to eat- you can't go by what the company says. You have to gauge your dog and weigh in factors like his metabolism, activity level, etc. I'd think feeding premade raw for a big dog like Jack would be horribly expensive. If I had no one to feed but Bruzer, then I might use the convenience of premade, but when you are going thru 5-6lbs of food a day, that would be way too expensive. For a while, when Daisy was around 100lbs and still growing, she was getting 5lbs of food a day to try and keep up with her growth. Now she's full grown and her metabolsm has slowed, but not her activity level, but I can feed her 3 to 3.5lbs a day now and she maintains her weight nicely. Gunnar can get 2-2.5lbs, and Bruzer gets about .5lb.