HOW MUCH DO I FEED?
http://rawfed.com/myths/feedraw.html
This will also vary with your dog. A dog that is more active and has a higher metabolism will eat more, while a less active dog or one with a slower metabolism will eat less. Puppies will typically eat more than adults, since they need to fuel their rapidly growing body.
The recommended food amount is 2-3% of your dog's desired body weight per day. So for a 100lb dog, you will be feeding 2-3 pounds of food a day. If you are gorging and fasting, you may be feeding 6 pounds or more on a gorge day. A highly active dog may need closer to 3%, while a dog with slower metabolism may need closer to 2%.
How do you know if your dog is too fat or thin? You should be able to easily feel your dog's ribs and even see the outline of the last few floating ribs at the end of the ribcage that attaches to the vertebrae of the spine closest to the hips. You should not be able to see ALL the ribs, or the hip bones, or the vertebrae of the spine, just the outline of the last few floating ribs. If you stand above your dog, he should have a definite waist between his hips and ribcage. Remember that dogs are built differently from each other, so some may have a naturally stocky body that will not give you a waist no matter what you do. Know your dog!
For a puppy, feed 2-3% of his expected adult body weight per day. Puppies under 4 months of age are very good at self-regulating their food intake, and can be given the opportunity to eat at a carcass or raw meaty bone until they are full at each meal. Pick up the leftovers and feed them later. If the puppy starts gorging himself to the point he has a huge, swollen, distended belly, or if he is getting fat, regulate his portions at 2-3% of his adult body weight per day. If the pup is looking very skinny and is not putting on weight, get a fecal sample done to make sure he does not have worms, and then up his food intake if needed. Keep in mind that puppies grow at a slower, more regulated rate on raw food than on commercial foods. This translates to less chance of developing the bone and joint problems seen in puppies fed commercial foods. Do not force feed your pup in an effort to make it grow faster or bigger.
For an overweight dog: determine the desired body weight and then feed 2-3% of that ideal body weight per day. For an underweight dog: determine the desired body weight and feed 2-3% of that desired weight per day. For maintenance: feed 2-3% of the dog's current body weight per day and adjust the food amount as needed.
I just pasted the one section here but recommend you read the whole lot of info
http://rawfed.com/myths/