What is a common sign of dehydration in animals?

Dry mouth is a common sign of dehydration in animals. When an animal is dehydrated, it loses fluids, which can lead to a reduction in the moisture levels in the mouth and oral tissues. This dryness can indicate that the body is not receiving enough fluids to maintain normal hydration levels.

In contrast, excessive energy is typically not associated with dehydration; usually, animals that are dehydrated may appear lethargic or weak due to a lack of energy. Increased appetite is also not a sign of dehydration, as it could be related to other factors and is not indicative of fluid loss. Bright eyes are often a sign of good health and proper hydration, while dull or sunken eyes may suggest dehydration. Therefore, dry mouth stands out as a clear and observable sign of dehydration in animals.