What does a cheetah use for shelter?
Cheetah do not live in shelters, they are animals of the open Savannah.
A mutualistic relationship is when both sides benefit from their interaction. In the case of the cheetah and the grasslands, although the grasslands are inanimate, the cheetah acts in keeping order amongst grassland species. For example by preying on animals that live in the grasslands, the cheetah stabilizes the animals population which in turn ensures that all the living animals have enough food/water/shelter to survive.