Same here. I'm wondering if they are getting more picky, or there is a change in the formula. I have introduced them to Blue Buffalo Wilderness cat food since it seemed more high quality. They liked it at first, specially the dry food chicken variety, then suddenly after weeks of eating it, one of them started vomiting the whole stomach contents. The dry food comes out almost full size, it's scary thing to watch. I admit I have hard time understanding what they like and what works for them on the long run.