Hi. I'm a new dog owner and new to this forum. Would really appreciate some feeding guidance for my Shih Tzu. We think Jasmine is around 4yrs old. She had puppies 11 weeks ago. They gave me Purina Puppy Chow to feed her because it has extra nutrients. She has behavior consistent with allergies: face rubbing, paw chewing and continuous ear and body scratching. I need to change her food. I am considering Wellness, Simple Food Solutions for relief of food allergies(dry food) or would you recommend another food? Also, what's the best way to transition her to new food? Thank you. I look forward to your advice.