Business Insider: Cats fart, just like dogs and people, but vets say excess or very smelly gas may point to a health issue It's natural for cats to fart if gas builds up in their digestive tract — just like people and dogs. Frequent or foul-smelling gas could mean your cat ate spoiled food or has a parasite or feline IBD. Cats fart, just like dogs and people, but vets say excess or very smelly gas may point to a health issue