A premium blend of compressed grass and alfalfa hay that, when placed in water, expands to create palatable, quality forage.

Purina Hydration Hay ORIGINAL Horse Hay Block is a premium blend of quality grass and alfalfa hay that has been compressed into a convenient, lightweight block. Simply drop the block into a bucket with 5 quarts of warm water, and it will quickly expand into about one flake of palatable, moist hay. Recommended for all horses at all life stages.