Hello, I've been a registered breeder of Chihuahua's for a few years now. When I bought my first Chi I was recommended to use 'Eukanuba' products. I have now been feeding all my dogs this diet for several years. I happen to mention this to my dog groomer, who has been breeding and exhibiting for around 25 years, and she JUMPED down my throat. She said that 'Eukanuba' had a product in it that extended the shelf life of the the dog food and was harmful to dogs. Apparently other brands had this product removed except for 'Eukanuba'. Does anybody know about this? I've been recommended to use 'Royal Canin' or 'Hills Science'..........What to do???