Isabelle, my Aussie pup, is 13 lbs. I've been feeding her Wellness puppy and the bag says for a 15 lb puppy 6 to 11 weeks old feed 2 1/4 cups per day. I could be wrong but this seems like a lot for a puppy to eat, it's as much as my adult dog eats. So my question is do I follow the instructions on the bag or is there a better way to determine how much she needs? Thanks in Advance!