Which of the following is a common sign of dehydration?

Dry skin is indeed a common sign of dehydration. When the body does not have enough fluids, it can lead to a decrease in moisture levels in the skin, resulting in dryness and potential flakiness. The body's cells may not receive enough water, which can impair their ability to maintain normal function and hydration levels.

In the context of dehydration, the skin may appear less elastic and may not bounce back as quickly when pinched. This is an important observation for healthcare providers, as it can be an indicator of a patient needing more fluids.

While other options like increased appetite, frequent urination, and weight gain do not specifically indicate dehydration, rather, they can be associated with other health conditions or dietary changes. Understanding these signs is crucial in a healthcare setting for monitoring patient well-being and responsiveness to fluid management.