Water supports almost everything a dog’s body does, including digestion, temperature control, and keeping joints and organs working. Most healthy dogs drink enough on their own if clean water is available. Sometimes, though, heat, exercise, illness, or a fussy drinker means they need a little help. This guide covers how to spot dehydration and how to encourage fluids safely.
If your dog is currently ill, our article on keeping a sick dog hydrated goes into that situation in more detail.
How much water does a dog need?
You will often see a rule of thumb of roughly one ounce of water per pound of body weight per day. Treat it as a rough starting point, not a target. Needs vary with size, age, diet, temperature, activity, and health. Dogs eating dry kibble usually drink more than dogs eating wet food, and active dogs, puppies, and nursing mothers tend to need more.
What matters most is noticing changes. A dog suddenly drinking much more or much less than usual is worth mentioning to your vet, as it can be a sign of a medical problem.
Signs of dehydration
Common signs include:
- Dry, tacky, or sticky gums
- A dry nose (on its own this is not a reliable sign)
- Low energy or lethargy
- Sunken eyes
- Loss of skin elasticity: skin lifted gently at the back of the neck is slow to settle back
- Thick saliva, or panting more than usual
- Darker, less frequent urine
The skin test and gum check are only rough guides. They can be unreliable in older, thin, or overweight dogs. If you see several of these signs, or your dog seems unwell, contact a vet.
Everyday ways to hydrate a dog
- Keep water fresh and clean. Refill bowls at least daily and wash them regularly.
- Put out several bowls around the home and yard so water is always close.
- Try a different bowl. Some dogs prefer ceramic or stainless steel to plastic.
- Try a pet fountain. Some dogs like running water.
- Bring water on walks and car trips, with a collapsible bowl.
- Make it a habit. Offer water after play, walks, and meals.
Adding moisture to food
Wet food has a much higher water content than dry kibble. You can also add warm water to kibble and let it soak, or mix in a little unseasoned broth. Check labels, as many human broths contain onion, garlic, or lots of salt, which are not suitable for dogs. See beef broth for dogs for more on choosing one.
Ice cubes, or frozen treats made from plain, dog-safe ingredients, can also be appealing, particularly in warm weather. Check that any fruit you use is safe for dogs.
Hot weather and exercise
Plan walks and play for cooler parts of the day, offer water breaks, and never leave a dog in a parked car. Panting heavily, drooling, vomiting, stumbling, or collapse can be signs of heatstroke, which is an emergency. Move the dog to a cool place and contact a vet right away.
How quickly can a dog rehydrate?
A mildly thirsty dog can recover within hours of drinking. But how long it takes depends on how much fluid has been lost and why. Dogs that have been vomiting, have diarrhea, or are very dehydrated often need fluids from a vet, sometimes given under the skin or through a vein, because drinking alone cannot keep up.
Be wary of any promise of “hydrating fast” at home. Letting a thirsty dog gulp a lot of water at once can bring it back up. Smaller, repeated drinks are generally gentler.
Gatorade, Pedialyte, and other drinks
Owners often ask about sports drinks and electrolyte solutions. These are made for people, and they may contain sugar, sweeteners, or flavorings that are not suitable for dogs, including some artificial sweeteners that are dangerous. Do not offer them without checking with your vet first. Plain water is the safe default, and your vet can recommend an appropriate oral rehydration option if one is needed.
Can a dog drink too much?
Yes. Some dogs, particularly those that gulp water while swimming or playing with a hose, can take in too much and develop water intoxication, which is an emergency. Signs can include vomiting, stumbling, bloating, or lethargy. Also, drinking a lot more than usual can signal conditions such as diabetes, kidney disease, or infection, so talk to your vet about it.
When to see a vet
Call your vet if your dog:
- Refuses water for a day or cannot keep it down
- Has repeated vomiting or diarrhea
- Shows several signs of dehydration, or seems weak or collapsed
- Is a puppy, senior, or has a health condition and seems off
- Is drinking and urinating much more than normal
For general guidance on looking after an unwell dog, see our guide to caring for a sick dog.