Flatulence problems and Cat food?

Ok, my cat is 6 months old and is constantly passing gas, it smells really bad. His feces are normal, not runny at all. Should I change his food? Another question I have is: I heard that you should give your cat a mixture of dry and wet food to prevent problems in their digestive tract, is this true? My parents... show more Ok, my cat is 6 months old and is constantly passing gas, it smells really bad. His feces are normal, not runny at all. Should I change his food?

Another question I have is: I heard that you should give your cat a mixture of dry and wet food to prevent problems in their digestive tract, is this true? My parents have always just given dry food to all of our cats and never had problems :/
Update: I am feeding him just dry food. Haven't given him any wet at all!
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