Stomach Bug 2025 How Long Does It Last In Cats. Duration of symptoms varies depending on the root cause. Cats with gastroenteritis, regardless of the cause, are often dehydrated and may need to be given fluids under the skin (subcutaneously) or directly into a vein (intravenously).

It is important to provide your cat with proper. How long does gastroenteritis last in cats?â depending on its cause, some cats can recover fully from gastroenteritis in less than two days’ time, but others might have to be monitored for one or two weeks.