Reviewed by: Dr. Randy Johnson, Pet Nutrition Expert
July 2024
As temperatures rise and we spend more time outdoors with our dogs, it's important to remember one of the most overlooked aspects of canine health: hydration.
Most pet parents know that dogs need access to fresh water, but many don't realize that dehydration can develop quickly—especially during warm weather, exercise, travel, or illness. In severe cases, dehydration can become a serious medical emergency.
Understanding the signs of dehydration and how to prevent it can help keep your dog healthy, comfortable, and safe all year long.
Why Is Hydration So Important for Dogs?
Water is essential to nearly every function in your dog's body. Proper hydration helps:
- Regulate body temperature
- Support healthy digestion
- Transport nutrients throughout the body
- Lubricate joints
- Aid kidney function
- Maintain healthy circulation
- Support normal cellular function
Without adequate water, these vital processes can become compromised, putting your dog's health at risk.
What Causes Dehydration in Dogs?
Dehydration occurs when a dog loses more fluids than they take in.
Some of the most common causes include:
- Insufficient access to fresh water
- Hot weather and excessive heat exposure
- Vigorous exercise
- Excessive panting
- Vomiting or diarrhea
- Loss of appetite
- Certain illnesses or medical conditions
Dogs that are sick, senior, very young, or highly active may be at greater risk of dehydration.
Signs of Dehydration in Dogs
One challenge for pet parents is that thirst isn't always the first sign of dehydration. A dog can become dehydrated before showing obvious signs of needing water.
Common signs include:
- Excessive panting
- Dry or sticky gums
- Loss of appetite
- Lethargy or weakness
- Sunken eyes
- Vomiting or diarrhea
- Excessive drooling
A simple at-home check is the "skin tent test." Gently lift the skin at the back of your dog's neck and release it. In a well-hydrated dog, the skin should quickly return to its normal position. If it remains elevated or returns slowly, dehydration may be present.
If you suspect dehydration, especially when accompanied by vomiting, diarrhea, weakness, or other symptoms, contact your veterinarian immediately.
How Much Water Does a Dog Need?
Water requirements vary based on a dog's size, age, activity level, diet, and environmental conditions.
A general guideline is that dogs should drink approximately one ounce of water per pound of body weight per day. During hot weather or periods of increased activity, water needs may increase significantly.
For example:
- A 20-pound dog may need about 20 ounces of water daily.
- A 40-pound dog may need about 40 ounces of water daily.
- A 60-pound dog may need about 60 ounces of water daily.
Dogs that eat primarily dry food often require more water than dogs consuming moisture-rich foods.
Tips to Keep Your Dog Properly Hydrated
Preventing dehydration is much easier than treating it. Here are a few simple ways to help your dog stay hydrated:
Provide Multiple Water Sources
Place fresh water bowls in several areas of your home and yard, especially during warmer months.
Refresh Water Frequently
Dogs are more likely to drink clean, cool water. Replace water regularly throughout the day.
Bring Water on Walks and Adventures
Always carry water and a portable bowl when hiking, traveling, or spending extended time outdoors.
Limit Heat Exposure
Avoid strenuous exercise during the hottest parts of the day and provide access to shade whenever possible.
Monitor After Exercise
Offer water before, during, and after physical activity to help replace fluids lost through panting.
Talk to Your Veterinarian
If your dog is highly active, recovering from illness, or has special health needs, ask your veterinarian about appropriate hydration and electrolyte support.
The Bottom Line
Hydration is one of the simplest—and most important—ways to support your dog's health. Fresh, clean water helps regulate body temperature, supports organ function, aids digestion, and keeps your dog feeling their best.
By staying alert to the signs of dehydration and taking proactive steps to provide plenty of water, you can help your dog safely enjoy all the adventures that spring and summer have to offer.
Because good health starts with the basics—and few things are more important than water.
Only Good. Always.