Occasionally there is just a farty smell - can be when he is lying relaxing or when he makes an effort like jumping down. The vet expressed his anal glands two weeks ago and says he can't be farting if we don't hear him do so. It doesn't smell fishy. She said to change food which is easier said than done when you have a ton of it in and the other one eats the same ( no smells) . His poos are normal and his bottom doesn't smell. Please someone else tell me they have had a farty cat 😂