We are trying lamb and lentils this week too. My guys have been on Fromm's Beef Frittata for a little over a year and although Blossom hasn't had severe allergy symptoms like she gets from chicken and salmon, she has started licking her paws. I was wondering if being on the same protein for an extended time may be causing her to be sensitive to it. I've fed them lamb and lentil for a couple of days now, and so far so good, no red or pink skin, no itching, and no chin acne. Time will tell I guess.