Ample hydration is important to a dog's health. If a dog is drinking less frequently, it may be a sign of illness, or it could merely signal a seasonal change.
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Frequency
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Dogs seldom drink a large volume of water at one time. A dog's reluctance to drink water could result from a simple lack of access. Make a supply of fresh water available at all times. Dogs prefer to drink small amounts of water throughout the day, versus a large volume several times a day.
Stress
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Drinking habits change when a dog is under stress. When a dog is faced with a new situation or is otherwise under stress, its eating and drinking habits may temporarily change.
Pain
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When a dog is in pain, especially if it has suffered a head trauma, it might not drink as frequently. Dental-related pain may also cause a reluctance to drink.
Illness
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There are several illnesses that may diminish a dog's thirst. Parvo, Leptospirosis, and rabies are three examples of medical issues that may affect a dog's drinking habits. Seek immediate veterinary care if dehydration or reluctance to drink accompanies diarrhea, vomiting or lethargy.
Seasonal Changes
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Dogs drink more water in the summer, and less in the winter. Dogs naturally drink more water in the summer, and their thirst decreases in the cooler months. Look for additional symptoms before assuming the animal is ill.
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