First off you are an angel to adopt this little girl.  Most people only want the young ones and the seniors get left out and eventually get put down or die in foster care.    
If you want to take the guess work out of a possible food allergy, and get her skin and coat in great shape, why not put her on red meat mixed with some steamed veggies such as green beans, carrots & broccoli, with some cooked pearled barley thrown it.  It's what I feed my girls.  I buy inexpensive round steak and also moc tenderloin and fry to med. rare.  They love meal time that's for sure, and their health is perfect. (But Zada has a collapsed trachea, but otherwise is healthy as can be). I also make their treats and keep in the freezer for extra crunch.  Easy as can be to home cook.        |