How Much Water Should A Dog Drink Calculator

How Much Water Should A Dog Drink Calculator

All dogs need to stay hydrated throughout the day. This can be a challenge for dogs in hot weather, when it’s difficult to keep fresh water cool and available. But even in cooler months, you should make sure your dog has access to fresh water whenever they want it.

Why Water Matters for Dogs & Cats

Drinking an appropriate amount of water is vital to the health of both dogs and cats:

  • 70% of your dog’s or cat’s body is made up of water
  • Water is required for every chemical process in the body

Water is the most important nutrient! Water moisturizes the air in the lungs, transports oxygen and nutrients in the bloodstream to cells, helps regulate body temperature, protects and lubricates internal organs and joints, helps eliminate waste from the body and supports nervous system function.

How Much Water Should a Dog Drink Per Day?

A general rule of thumb for how much water a dog should drink is 1 ounce of fluids per pound of body weight. So a 10-pound dog should drink roughly 10 fluid ounces per day; a 100-pound dog should drink roughly 100 fluid ounces. How much water should a dog drink who is very active, lives in a hot climate or is lactating? Those dogs will drink more than other dogs, and puppies will often consume more water than adult dogs. A dog that eats wet food may also drink less water than a dog who eats kibble.

Outdoor portrait of a Parson Russell Terrier lying in front of a water dish

Why is my Dog Always Thirsty?

Drinking too much and peeing too much can be signs of an underlying medical condition in a dog. These conditions may include hormonal disorders such as diabetes mellitus, diabetes insipidus, Cushing’s syndrome, kidney disease, liver disease, cancer, fever and infection. Certain medications can cause increased thirst as well. If you notice that your dog is drinking more than usual, make an appointment with your veterinarian.

How Much Water Should a Cat Drink?

Compared to dogs, cats drink less water. In general, adult cats should consume anywhere between 5 to 10 fluid ounces of water per day, depending on their size, activity level, type of food and other factors, such as overall health and ambient temperature. If you feed your cat dry kibble, then they may drink closer to 10 ounces per day, and if you feed them canned food, they may drink closer to 5 ounces because of canned food’s high moisture content.

How much water does your dog need?

How much water does your dog need?

The amount of water a dog needs varies from breed to breed. It also depends on the size and age of your dog, as well as how active it is. The environment in which you live can also influence how much water your dog gets. For example, if it is hot and humid outside, then you may have to increase their intake of liquid to compensate for their increased water loss through sweat and respiration. This can be difficult if you are not sure exactly how much liquid they are losing!

To help make sense of all these factors at once, we created this calculator using data from several sources including: (1) The Merck Manual; (2) Academy Of Veterinary Nutrition; (3) VCA Animal Hospitals; and (4).

Body Weight (Dry)

The next step is to figure out how much water to give your dog. First, you’ll want to know the body weight of your dog. A healthy dog should be between 12 and 14 pounds, but you can use this calculator for any size dog by simply adjusting the numbers according to their size.

The body weight (dry) is determined by multiplying the weight of your dog without water by 0.62:

Body Weight (Dry) = Wt – H2O x 0.62

Activity Level

Dogs that are active need to consume more water than dogs that are sedentary. An active dog is a dog that will be running, playing, and otherwise exerting themselves physically. These dogs can look for water in any number of places and don’t always understand the importance of making sure they remain hydrated. Signs of dehydration include:

  • Reduced ability to play or exercise
  • Reduced urine output
  • Panting with open mouth

If you notice these signs in your dog, give them an extra bowl of fresh water before going out for their walk or run on the treadmill.


The environment in which your dog lives is another factor that will determine how much water a dog should drink. Dogs living in hot climates need more water, as their bodies are trying to cool down, while dogs living in cold climates require less water because they are not generating as much heat. Similarly, dogs that live in dry environments will require more hydration than those who live in humid ones.

Dry Dog Food Foam

The answer to this question depends on a number of factors.

  • How old is your dog? The older a dog gets, the more water they need to consume.
  • What breed is your dog? Different breeds have different water requirements. For example, labs and retrievers tend to be larger than other dogs and therefore require more water intake per pound of body weight than smaller breeds like terriers or poodles.
  • How active is your dog? A very active dog will need more water than one that spends most of their time indoors or lounging around the house all day because activity increases metabolism and heat production which results in increased fluid loss from sweat or panting due to exercise.* Is your dog currently pregnant or nursing puppies? If so, then she will likely need more fluids during these times—but don’t worry too much if you haven’t had puppies yet! You can still do some calculations now so when they come along later down the road there won’t be any surprises (or panic attacks).

You should allow your dog to drink as much fresh, clean water as possible. Make sure that this water stays cool and is changed at least twice a day.

Water is essential for your dog to stay hydrated and healthy.

It’s also important for a dog’s digestion, kidney function, and heart function.

Water is vital to the health of their skin and coat as well!


The water needs of a dog will depend on its size, activity level and environment. However, there are some general guidelines that can help you to determine what sort of amount is appropriate for your pet. The first thing you should do is check the label on food products because most companies have instructions about how much water should be given daily. If this information isn’t available then use our ‘How Much Water Should My Dog Drink’ chart above as a starting point!

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