Missy gave birth 10 days ago and she passes THE nastiest smelling gas! It smells like she should have diareah, but I've checked the boxes and everything is solid. I'm feeding her Science Diet Kitten Formula Dry Food. I still feed the other cats their normal food - Purina Kitten Chow - and she's probably still eating some of that too. Is it normal for it to smell so horrible? It runs me out of the closet!!!