How a Liquid Nutritional Supplement Increases Water Intake in Dogs
This scientific study from the University of Liège investigated whether a highly palatable liquid nutritional supplement could safely increase water consumption in dogs. Using eight healthy adult Beagles in a controlled cross-over design, researchers compared normal drinking behaviour to drinking behaviour when the supplement was added to the water at two dosages (50 ml/day and 70 ml/day). Despite natural variation in individual drinking habits, results showed a consistent and significant increase in water intake — an average rise of 28 percent across all dogs, regardless of gender or dosage. Dogs consumed the supplemented water immediately after it was offered, demonstrating strong palatability and immediate effect. Importantly, this increase was achieved without a meaningful rise in dietary sodium, meaning hydration improved without undesirable salt loading.
The supplement also increased urine output by 47 to 55 percent while keeping urine density within healthy ranges. Faecal scores remained stable, showing that digestion was unaffected. The study confirmed that the manufacturer’s recommended dose of 50 ml/day for medium-sized dogs is effective, and raising the dose offered no added benefit. These findings highlight that adding a nutrient-rich, appetizing liquid to drinking water can be a gentle and effective strategy for improving hydration — especially relevant for dogs needing increased diuresis, such as those prone to urolithiasis or dogs at risk of dehydration.
Clinical Importance and Applications for Pet Health
Hydration plays a central role in maintaining kidney health, preventing urinary stones and supporting overall physiological function. For small-breed dogs, who naturally produce lower urine volumes, stimulating water intake can be particularly valuable. This study shows that a palatable, low-sodium liquid nutritional formula can reliably boost both water intake and urine output without adverse effects. Because the supplement also contains essential nutrients — including proteins, fats, minerals, prebiotics and functional fibers — it can provide additional benefits such as improved appetite, enhanced nutrient absorption and better hydration in hospitalized or recovering dogs.
The authors conclude that this type of supplement can be used in several practical contexts: to encourage drinking in clinical settings, to support dogs with urinary stone disease, to help active or sporting dogs stay hydrated and to encourage appetite when mixed with food. Its liquid format ensures rapid acceptance, high palatability and efficient uptake of nutrients.
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