Keeping senior pets hydrated and comfortable all summer long

Older dogs and cats are at increased risk of dehydration during warm weather because of age-related physiologic changes, chronic disease, mobility limitations, cognitive decline, and medication use.

Even subtle dehydration can contribute to lethargy, decreased appetite, constipation, urinary issues, and progression of kidney disease. For senior pets in particular, maintaining adequate hydration can meaningfully improve comfort and quality of life.

Why senior pets are more vulnerable

As pets age, their ability to conserve water and regulate body temperature may decline. Many senior patients live with chronic conditions such as kidney disease, diabetes mellitus, cancer, or gastrointestinal disease that increase fluid loss or alter thirst mechanisms. Medications, including diuretics and some anti-inflammatory drugs, may further raise the risk of dehydration.

Cats present a particular challenge because their natural thirst drive is relatively low, and they evolved to obtain much of their moisture from prey. Even mild dehydration in older cats can exacerbate urinary and renal concerns. Increased moisture intake has been associated with improved urine dilution and urinary tract health in cats.^1-4

Offer multiple water sources

Small environmental and dietary adjustments can significantly increase voluntary water intake for many pets.

Senior pets may drink more when water is easy to access. Placing multiple water bowls throughout the home is especially helpful for animals with arthritis, weakness, or cognitive dysfunction. Raised bowls are often more comfortable for dogs (and some cats) with osteoarthritis and may encourage more regular use.

Cats often have strong preferences regarding water presentation. Some prefer wide, shallow bowls that reduce whisker contact, whereas others are drawn to moving water from fountains. Stainless steel, ceramic, and glass bowls are generally preferred over plastic because they are easier to sanitize and less likely to retain odors. Water should be refreshed frequently, particularly during the summer.

Consider pet fountains

Many cats, and some dogs, are more interested in moving water than in still water. Pet fountains can encourage drinking by providing continuous movement and aeration. Some cats also prefer elevated fountains or even dripping faucets, and these options can be suggested to owners as part of a tailored hydration plan.

Incorporate wet food

Increasing dietary moisture is one of the simplest ways to support hydration, particularly in cats. Canned diets typically contain 70% to 80% moisture and can substantially increase total daily water intake.^1,2 This strategy is especially useful for senior cats with chronic kidney disease, lower urinary tract disease, or poor thirst drive. Even adding water to canned food or soaking kibble can help increase moisture consumption in some patients.

Dogs can also benefit from moisture-rich diets during hot weather, especially seniors prone to dehydration or constipation.

Hydration-support products

Hydration-support products can be considered as adjuncts for appropriate patients. One example is Purina Pro Plan Veterinary Supplements Hydra Care, a nutrient-enriched hydration supplement formulated for cats. Studies of nutrient-enriched water supplements have demonstrated increased voluntary fluid intake, greater urine volume, and improved hydration markers in cats receiving these products.^2,5 These supplements may be particularly helpful for senior cats with chronic kidney disease, urinary concerns, or decreased appetite, but they should complement–not replace–fresh water and appropriate veterinary care.

Frozen treats, ice cubes, or low-sodium broth ice treats may encourage fluid intake in some dogs during hot weather. Cats may accept flavored ice cubes made from diluted tuna water or low-sodium broth, especially when introduced gradually.

Summer safety considerations

Hydration and heat safety are closely linked. Senior pets are less tolerant of heat and may be slower to compensate during hot weather. Veterinary teams can remind clients to:

• Avoid exercise during peak heat hours
• Always provide shade and fresh water outdoors
• Never leave pets in vehicles
• Monitor for signs of overheating, including excessive panting, lethargy, vomiting, weakness, or collapse
• Recognize that brachycephalic pets and pets with cardiac or respiratory disease may overheat more quickly

Indoor pets are not exempt from risk. Older cats in warm homes without adequate airflow may also become dehydrated during the summer months.

Helping clients recognize dehydration

Clients frequently underestimate early dehydration. Veterinary professionals can encourage owners to watch for:

• Dry or tacky gums
• Sunken eyes
• Decreased appetite
• Lethargy
• Reduced skin elasticity
• Increased panting
• Constipation
• Changes in urination habits

Senior pets showing these signs should be evaluated promptly, especially if underlying disease is present.

Small changes, meaningful impact

Hydration support does not always require intensive interventions. Often, simple steps such as adding canned food, offering a fountain, placing additional water bowls around the home, or introducing hydration-support supplements are both feasible for owners and effective for patients.

For senior dogs and cats, these small changes can improve comfort, support organ function, and help them navigate the warmer months more safely while maintaining quality of life.

References

1. Bernal D. Wet cat food: more than a meal, a key ingredient for feline wellbeing. AAHA NEWStat. Accessed May 14, 2026. https://www.aaha.org/newstat/publications/wet-cat-food-more-than-a-meal-a-key-ingredient-for-feline-wellbeing/
2. Zanghi BM, et al. Effects of a nutrient-enriched water on water intake and hydration in cats. Am J Vet Res. 2018.
3. Cornell Feline Health Center. Hydration. Cornell University College of Veterinary Medicine. Accessed May 14, 2026. https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/hydration
4. Cat Friendly Homes. How to increase your cat's water intake. American Association of Feline Practitioners. Accessed May 14, 2026. https://catfriendly.com/keep-your-cat-healthy/water-intake/
5. Purina Pro Plan Veterinary Supplements. Hydra Care product information. Purina. Accessed May 14, 2026. https://www.purina.com/pro-plan-vet/supplements/hydra-care