I have 2 kittens about 5 months old, and one or both of them farts. All the time. It's one of the worst smells I've ever smelled in my life. It's hard to tell if it's only one of them because they're almost identical (siblings) and sometimes one will be on my lap and I don't know which one it is. So let's assume both. I've tried 4 or 5 different dry foods, Purina, Wysong, Diamond Naturals, others recommended by my vet, and nothing has had any effect on his reeking bowels. Turds are firm, maybe a little on the soft side now & then, no diarrhea unless they eat too much wet food (only given as treats now & then.) They don't get milk or any dairy products so I don't think it's lactose intolerance. In every other way I can think of they're 100% normal - activity, how much and how often they eat, how often they shit (a lot, and also very stinky.) It may happen a little more often during play or other activity, and when I pick them up. No evidence of worms, I haven't seen any butt drags being done on the carpet and no rice around the bunghole. Any ideas? Vet visits for shots & neutering are probably a couple months down the road but I can take them sooner if I have to.