The water-urine connection

One reason that cat urine has such a powerful odor is that it is highly concentrated—a lot of waste matter in a relatively tiny amount of water. The urine of humans or dogs is, by comparison, much more watery.

Since cats lose less water through urination, they require less than humans do, and they can go much longer without water than a human or a dog can. But like all living things, cats do require water. In fact, a cat’s body is about 70 percent water, which is true of you as well. Stating the obvious, the drier the food your cat eats, the more water is required.