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Drinking caused by exposing dogs to radiant heat
The Journal of Physiology
|January 1, 1977
Summary
Dogs increase drinking to match evaporative water loss from heat exposure. Drinking during heat occurs at lower dehydration levels than when offered post-heating, indicating a threshold for thirst.
Area of Science:
- Physiology
- Thermoregulation
- Animal Behavior
Background:
- Radiant heat exposure triggers panting and evaporative water loss in dogs.
- Understanding hydration regulation is crucial for animal welfare and performance.
Purpose of the Study:
- To investigate drinking behavior in dogs exposed to radiant heat.
- To determine the relationship between water loss and drinking during and after heat exposure.
Main Methods:
- Dogs were exposed to radiant heat, with water offered at intervals.
- Water intake was measured during and after heating periods.
- Dehydration levels and water loss were quantified.
Main Results:
- Evaporative water loss ranged from 40-70 g/hr during heating.
- Dogs drank opportunistically during heating, matching approximately half of their water loss.
- Drinking post-heating only occurred if water loss exceeded a threshold (50-70 g), indicating a higher dehydration requirement.
Conclusions:
- Drinking behavior is modulated by the timing of water availability relative to heat exposure.
- Heat-induced drinking occurs at lower dehydration levels compared to resting states.
- Similar drinking responses were observed between heat exposure and strenuous exercise (running).