This document provides a brief summary of factors that affect the welfare of confined cats. Although we offer specific environmental enrichment recommendations for cats caged in shelters, research facilities, veterinary hospitals, or boarding facilities, the same principles also can be applied to client-owned, indoor-housed cats. The overarching principle is to always offer any resource change as a choice, so the cat can express its preferences. Observe the cat’s reaction and discontinue or remove anything that causes the cat to jump, cower, hide, shake, or otherwise act fearful or nervous. For additional information please refer to the resource list at the end of the document.