Maybe you could email Purina and ask them for a sample of this formula? Some pet stores carry samples, but if not, I'm sure they would be glad to send you a couple. You can fill this out to get a coupon for a free 1.8 kg bag of Purina One. I signed up for it after I saw it on a freebie site and recieved my coupon for a free bag! I am pretty sure you can select any formula with the coupon.