Pens in is a term used to describe the act of containing animals, such as horses, cows, and sheep, within an enclosed area. The crossword solutions for this term are CORRALS (7 letters) and ENCLOSES (8 letters). CORRALS are typically made of wood or metal fencing and are used to keep animals contained in a specific area. Encloses are also used to contain animals, but they are usually larger than CORRALS and are made of stone walls or other materials. Both CORRALS and encloses are used to protect animals from predators and to keep them safe.