 Cats conserve heat by reducing the flow of blood to their skin and lose heat by evaporation through their mouths . Cats have minimal ability to sweat , with glands located primarily in their paw pads , and pant for heat relief only at very high temperatures ( but may also pant when stressed ) . A cat 's body temperature does not vary throughout the day ; this is part of cats ' general lack of circadian rhythms and may reflect their tendency to be active both during the day and at night . Cats ' feces are comparatively dry and their urine is highly concentrated , both of which are adaptations to allow cats to retain as much water as possible . Their kidneys are so efficient , they can survive on a diet consisting only of meat , with no additional water , and can even rehydrate by drinking seawater . 
