Hi, I have 4 cats. I currently feed them the Blue buffalo dry cat food. I am switching them to the wilderness formula but haven't started that process yet. Occ. 1 of my cats vomit up there food after being fed. It's nothing I am hugely concerned with, as it only happens once in a blue moon. Well, it turns out it is becoming more freq. then it once was. I don't believe it's the cat food since they have been on this brand of cat food for almost their entire lives. I don't think there's a foreign body to be concerned about since again it doesn't happen all the time. We did recently start to water down their dry food to help get more moisture into their system but they seem to take that okay. Any thoughts?