I have fed all my dogs purina one dry kibble, no table food. All have thrive scv on it, living ling years. I have a 1.5 year old beagle on it too. My new pup beagle has been on it from 3 months to 6.5 months. This one eats 2.25 cups per day, and is very skinny at nearly 7 months, approximately 15-17#. No worms. Good bowel movements. Should I fed her more?