I was wondering if it'd be bad to switch food cold turkey? Our new little guy was fed purina PUPPY (not large breed puppy just regular puppy) kibble but we feed Canidae. I have been giving him a little more Canidae each day to his regular Purina Puppy food but basically I'm out of Purina but have not finished the transition. Will it be ok to just give him all Canidae tomorrow or should I get a little bag of purina? He's a golden retriever and is 11 weeks old and about 12 pounds or so. He's a big little boy.