Cats often do not drink enough water to stay as hydrated as they should be. This is because cats in the wild would get a lot of moisture from eating raw prey, but cats who are fed dry kibble are not getting that valuable hydration from their food. Cats don’t generally have a strong thirst drive, as they have evolved to get the moisture they need from the prey that they eat. A mouse’s composition is close to 80% moisture. A tiger’s meal consists of meat, bone, organs and moisture.