Thank you, Denise and Patty. This morning, he scarfed down some bagel for breakfast with me, reminded me in no uncertain terms that it was turkey-time at lunch (drop everything, Mommy, I want my turkey NOW!)...and seems to have more vim and vigor today. He seems to love his new food and, so far, I've seen no adverse effects (those with furbabies will know what I mean!) while transitioning from his old food to the new.