How to help your dog stay hydrated, maintain electrolyte balance, and support healthy kidney function during hot weather.

Summer means more outdoor adventures, longer walks, beach days, and backyard playtime. But while many dogs love warm weather, heat can place significant stress on the body, especially the kidneys.

Dogs regulate temperature very differently than humans. They don't sweat efficiently through their skin and rely primarily on panting to cool themselves down. During periods of excessive heat, exercise, or dehydration, the body may lose valuable fluids and electrolytes, increasing strain on multiple organ systems, including the kidneys.¹

The good news? With a few proactive steps, pet owners can help support hydration, electrolyte balance, and overall wellness throughout the summer months.

Why Hydration Matters More Than Most Pet Owners Realize

Water is involved in nearly every function in your dog's body.

Proper hydration supports:

• Healthy kidney filtration

• Nutrient transport

• Temperature regulation

• Joint lubrication

• Digestion

• Circulation

• Cellular health

Even mild dehydration can impact performance, energy levels, and overall well-being.²

When temperatures rise, dogs lose more water through:

• Panting

• Increased activity

• Travel

• Stress

• Gastrointestinal upset

• Time spent outdoors

For senior dogs and dogs with underlying kidney concerns, hydration becomes even more important.

The Connection Between Heat and Kidney Stress

The kidneys act as the body's filtration system, helping regulate fluid balance and remove waste products.

When a dog becomes dehydrated:

• Blood flow to the kidneys may decrease

• Waste products can become more concentrated

• Electrolyte imbalances may develop

• The kidneys may need to work harder to maintain normal function

Severe dehydration and heat-related illness can contribute to acute kidney injury in some cases.³

This is one reason veterinarians take heat stress and heatstroke so seriously.

Signs Your Dog May Be Dehydrated

Watch for:

• Excessive panting

• Dry or sticky gums

• Sunken eyes

• Lethargy

• Reduced skin elasticity

• Weakness

• Loss of appetite

• Dark yellow urine

If you suspect significant dehydration, contact your veterinarian promptly.

Signs of Heat Stress and Heatstroke

Heatstroke is a medical emergency.

Warning signs may include:

• Excessive panting

• Bright red gums

• Drooling

• Vomiting

• Diarrhea

• Weakness

• Disorientation

• Collapse

• Seizures

Certain breeds are at greater risk, including:

• Bulldogs

• Pugs

• Boxers

• French Bulldogs

• Other brachycephalic (short-nosed) breeds

Senior dogs, overweight dogs, and dogs with chronic medical conditions may also be more vulnerable.⁴

Practical Hydration Tips for Summer

1. Bring Water Everywhere

Never assume water will be available.

Keep:

• Portable water bowls

• Travel bottles

• Collapsible bowls

• Extra water in the car

available during walks, hikes, beach trips, and travel.

2. Encourage Drinking Throughout the Day

Some dogs don't drink enough on their own.

You can increase fluid intake by:

• Adding water to meals

• Offering bone broth formulated for dogs

• Feeding moisture-rich foods

• Providing multiple water stations around the home

3. Avoid Midday Heat

Schedule walks:

• Early morning

• Late evening

when temperatures are lower.

Remember that pavement can become dangerously hot and may burn paw pads.⁵

4. Provide Shade and Cooling Opportunities

Outdoor dogs should always have access to:

• Fresh water

• Shade

• Air circulation

• Cooling mats or shaded resting areas

Never leave a dog in a parked vehicle, even for a short period.

Electrolyte Balance: Why It Matters

Electrolytes help regulate:

• Hydration

• Muscle function

• Nerve signaling

• Heart function

• Cellular communication

Important electrolytes include:

• Sodium

• Potassium

• Chloride

• Magnesium

During heavy panting, prolonged activity, gastrointestinal upset, or heat stress, electrolyte balance can be affected.⁶

However, pet owners should avoid giving human electrolyte products unless specifically directed by a veterinarian, as many contain ingredients inappropriate for dogs.

Supporting Kidney Health Naturally

Hydration is the foundation of kidney support.

Many holistic veterinarians also focus on:

• High-quality species-appropriate nutrition

• Maintaining a healthy body weight

• Omega-3 fatty acids

• Antioxidant-rich foods

• Avoiding toxin exposure

• Regular veterinary wellness screening

For aging dogs, periodic bloodwork may help monitor kidney health before symptoms become obvious.

Dogs at Higher Risk During Summer

Extra caution is warranted for:

• Senior dogs

• Puppies

• Dogs with kidney disease

• Dogs with heart disease

• Brachycephalic breeds

• Overweight dogs

• Highly active sporting dogs

These animals may require more frequent hydration breaks and closer monitoring during hot weather.

Final Thoughts

Summer should be enjoyable for both you and your dog.

By paying attention to hydration, avoiding excessive heat exposure, and supporting healthy kidney function, you can help your dog stay active, comfortable, and safe all season long.

A few simple habits—fresh water, shade, smart exercise timing, and awareness of heat stress symptoms—can go a long way toward protecting your dog's health.

References

1. Bruchim Y, et al. Heat stroke in dogs: A retrospective study. J Vet Intern Med. 2006.

2. Armstrong LE. Hydration assessment techniques. Nutr Rev. 2005.

3. Hall JA, et al. Kidney health and hydration in companion animals. Vet Clin North Am Small Anim Pract. 2016.

4. Hall EJ, Carter AJ, O'Neill DG. Incidence and risk factors for heat-related illness in dogs. Sci Rep. 2020.

5. American Veterinary Medical Association (AVMA). Hot weather pet safety guidance.

6. DiBartola SP. Fluid, electrolyte, and acid-base disorders in small animal practice. Elsevier Veterinary Medicine.