How much you feed your dog should be based on the size of your dog. Small dogs usually eat 1/2 -1c 2 times a day. Medium dogs 1c-2c 2 times a day. Large dogs 2c-3c 2 times and extra large dogs 3c-4c 2 times.
The recommendations can be easily found on the package of dog food so there is not an answer that would cover everyone. Therefore, the amount of protein will vary with the your dog's size and breed.
