Which of the following describes normal mucus membranes?

Normal mucus membranes are characterized by a pink and moist appearance. This indicates healthy blood circulation and hydration status in the animal. The pink color is a sign of adequate oxygenation and proper blood flow, while the moistness suggests that the membranes are well-hydrated. These features are important indicators of a dog's overall health and can be supportive information when evaluating its physiological status.

In contrast, the other options describe conditions that indicate problems. Pale and dry membranes suggest dehydration or shock, while cyanotic (bluish) and tacky (sticky) membranes signal inadequate oxygenation or poor perfusion. Furthermore, yellow and hyperemic (excessively red) membranes may indicate liver issues or other systemic problems. Thus, the presence of pink and moist mucus membranes is a key element in assessing the health of a canine patient.