Short answer: most healthy adult dogs drink roughly 40 to 60 ml of water per kilogram of body weight a day, which works out to about 0.6 to 0.9 fluid ounces per pound. A popular, slightly more generous rule of thumb is about 1 ounce per pound, so a 50-pound dog drinks somewhere around 4 to 6 cups a day. Dogs that eat canned food, rest in cool weather or are small often drink less; active dogs, hot days and dry kibble push the number up. If your dog regularly drinks more than about 90 to 100 ml per kg (roughly 1.4 to 1.6 oz per pound) a day, talk to your vet.
Below you’ll find a daily water chart by weight, what changes how much a dog drinks, how to measure your dog’s intake at home, guidance for puppies, and the signs that drinking too much or too little is a reason to see your vet.
How much water a dog needs: chart by weight
The “typical range” column uses the 40–60 ml/kg per day normal intake given by Cornell University’s Riney Canine Health Center. The “1 oz per lb” column is the rule of thumb used by PetMD and the American Kennel Club. The last column is the level at which veterinarians usually start to call drinking excessive (polydipsia), using Cornell’s 100 ml/kg figure.
| Dog’s weight | Typical range (40–60 ml/kg) | Rule of thumb (1 oz per lb) | Talk to your vet if regularly more than |
|---|---|---|---|
| 5 lb (2.3 kg) | 3–5 oz (90–140 ml) | 5 oz (about ⅝ cup) | 8 oz (1 cup) |
| 10 lb (4.5 kg) | 6–9 oz (180–270 ml) | 10 oz (1¼ cups) | 15 oz (about 2 cups) |
| 20 lb (9.1 kg) | 12–18 oz (360–540 ml) | 20 oz (2½ cups) | 31 oz (about 4 cups) |
| 30 lb (13.6 kg) | 18–28 oz (540–820 ml) | 30 oz (3¾ cups) | 46 oz (about 6 cups) |
| 40 lb (18.1 kg) | 25–37 oz (730–1,090 ml) | 40 oz (5 cups) | 61 oz (about 7½ cups) |
| 50 lb (22.7 kg) | 31–46 oz (0.9–1.4 L) | 50 oz (6¼ cups) | 77 oz (about 9½ cups) |
| 60 lb (27.2 kg) | 37–55 oz (1.1–1.6 L) | 60 oz (7½ cups) | 92 oz (about 11½ cups) |
| 80 lb (36.3 kg) | 49–74 oz (1.5–2.2 L) | 80 oz (10 cups) | 123 oz (about 15 cups) |
| 100 lb (45.4 kg) | 61–92 oz (1.8–2.7 L) | 100 oz (12½ cups) | 153 oz (about 19 cups) |
These are estimates for healthy adult dogs, not targets to hit. The 1 oz per lb rule (about 65 ml/kg) sits a little above the typical range, which is why it’s best read as a generous ceiling for an ordinary day. Some veterinary references use 90 ml/kg rather than 100 ml/kg as the cut-off for excessive drinking.
You don’t need to measure your dog’s water every day. PetMD’s veterinary-reviewed guidance is simple: keep fresh water available and don’t restrict it unless your vet tells you to. The chart is most useful as a reference point when you suspect something has changed.
What changes how much water a dog drinks
Two healthy dogs of the same weight can drink very different amounts. The main reasons:
- Diet. Canned and homemade diets are about 65–80% water, according to PetMD, so dogs eating them get much of their water from food and may barely touch the bowl. Dogs on dry kibble drink more.
- Heat and exercise. Dogs cool themselves mainly by panting, which loses water. Expect your dog to drink more on hot days and after walks, runs and play, and bring water along on long outings.
- Pregnancy and nursing. Pregnant and nursing dogs need more water and are at higher risk of dehydration.
- Age and size. Puppies need proportionally more water than adults (see below). Puppies, senior dogs and toy breeds are also more vulnerable to dehydration, according to the AKC.
- Medications. Some common drugs increase thirst and urination, including steroids such as prednisone (glucocorticoids) and diuretics. If your dog started a new medication and is suddenly drinking more, ask your vet whether that’s expected.
- Salty food. Salty treats or table scraps can make a dog thirsty for a while.
- Illness. Many diseases make dogs drink more, and pain, nausea or general illness can make them drink less. That’s why a lasting change in either direction is worth a call to your vet.
How to measure your dog’s water intake at home
If you think your dog is drinking more (or less) than usual, a few days of measuring gives you and your vet real numbers instead of a guess. VCA Animal Hospitals recommends measuring how much your dog drinks over 24 hours, because it helps the vet judge how serious the problem is.
- Start with a measured amount. Fill the bowl with a known amount of water using a measuring cup or jug, at the same time each morning.
- Top up with measured amounts too, and write down each refill.
- Measure what’s left after 24 hours. Water added minus water left over is roughly what your dog drank.
- Account for other sources. Note outdoor bowls, puddles, the toilet bowl, wet food and any water on walks. If several pets share a bowl, Cornell points out that it’s much harder to tell who is drinking what; separate the pets during the test if you can.
- Repeat for two or three days and divide by your dog’s weight to compare with the chart above. Spills and evaporation mean the result is approximate, which is fine.
It also helps to note how often your dog asks to go out and whether there are accidents in the house, because drinking more almost always means peeing more.
How much water should a puppy drink?
Very young puppies get their fluids from their mother’s milk. Once weaning starts, they need fresh water available. The AKC’s guidance is:
- Young puppies: generally about half a cup of water every two hours.
- Weaned puppies: between half an ounce and one ounce of water per pound of body weight per day, so a 20-pound puppy needs roughly 10 to 20 ounces, more on very active days.
- Don’t restrict water during the day. Puppies dehydrate more easily than adults.
- At night, during house training, the AKC suggests picking up food and water about two to three hours before bedtime at a consistent time, so your puppy can have a final potty break before sleeping.
Drinking and peeing go hand in hand: a puppy usually needs to go out shortly after drinking. Our puppy potty schedule by age shows how often to plan those trips.
Is your dog drinking too much water?
Drinking noticeably more than usual is called polydipsia, and it usually comes with peeing more (polyuria). Heat, exercise and a change to dry food are harmless explanations. But according to Cornell’s Riney Canine Health Center, increased thirst can also be a sign of conditions such as:
- Kidney disease
- Diabetes mellitus
- Cushing’s syndrome or Addison’s disease (adrenal gland disease)
- Liver disease
- Urinary tract infection
- Pyometra, a serious uterine infection in female dogs that aren’t spayed
- Some cancers, and infections such as leptospirosis
Signs your dog may be drinking more than normal include an empty bowl that you’re refilling more often, drinking from puddles or the toilet, asking to go out more, accidents in the house, and leaking urine while asleep. Senior dogs are more likely to develop several of these conditions; if you’re not sure whether your dog counts as a senior yet, see our dog age in human years chart by size.
Your vet will usually start with a physical exam, blood work and a urinalysis (including urine specific gravity, which shows whether the urine is dilute), and add other tests depending on the results.
Rarely, a dog can take in far too much water in a short time. The AKC notes that this “water intoxication” can be as dangerous as dehydration. Signs include lethargy, nausea, vomiting, loss of coordination or staggering, bloating, dilated pupils, excessive drooling and pale gums. Contact your vet immediately if you see them.
Is your dog drinking too little? Signs of dehydration
Dogs can become dehydrated if they don’t drink enough, or if they lose fluids through vomiting, diarrhea, fever, heavy panting or heatstroke. According to the AKC and PetMD, signs include:
- Dry, sticky or pale gums, and thick saliva
- Dry nose and mouth
- Sunken, dry-looking eyes
- Low energy or lethargy, and loss of appetite
- Panting
- Vomiting, with or without diarrhea
Two quick checks you can do at home:
- Skin test: gently lift the skin between the shoulder blades and let go. In a well-hydrated dog it snaps straight back; in a dehydrated dog it returns slowly or stays tented. Try it when your dog is well first so you know what’s normal, especially for wrinkly breeds.
- Gum check: the gums should be moist, not dry or tacky. Press a fingertip on the gum and release; the pale spot should turn pink again almost immediately (AKC’s puppy guide says within about two seconds).
Coming soon: Pet Planner
Pet Planner is the pet care log we’re building at AppSphere Solutions. Log drinks, meals, pee, poop and walks for each pet with one tap, see the day’s and week’s totals on the Home screen, and look back at Insights charts by day, week, month or year, so a change in habits is easier to spot and to describe to your vet. It isn’t released yet, but you can join the waitlist to hear when it’s ready for iPhone and Android.
No launch date yet. See what Pet Planner does
When to call your vet
- Call promptly if your dog has been drinking or peeing noticeably more than usual for more than a day or two without an obvious reason such as heat or exercise, especially if it comes with weight loss, a change in appetite, accidents in the house or lethargy. Measuring intake for a day or two beforehand (see above) is helpful but shouldn’t delay the call.
- Call promptly if your dog is drinking much less than usual or has stopped drinking.
- Treat it as an emergency if your dog shows signs of dehydration, has persistent vomiting or diarrhea, may have heatstroke, or shows signs of water intoxication. An unspayed female who is drinking more and seems unwell also needs to be seen urgently, because pyometra can be life-threatening.
Offer fresh, cool water while you get advice. The AKC says an electrolyte drink can be tried only if your dog isn’t vomiting, and only with your vet’s guidance on how much.
This guide is general information and isn’t a substitute for advice from a veterinarian who knows your dog.
FAQ
How much water should a 50-pound dog drink a day?
Roughly 31 to 46 ounces (about 4 to 6 cups) on a typical day, based on a normal range of 40–60 ml per kg. The 1 ounce per pound rule of thumb gives about 50 ounces (6¼ cups). Hot weather, exercise and dry food can push it higher; regularly drinking more than about 77 ounces (9½ cups) is worth discussing with your vet.
How much water should a puppy drink?
According to the AKC, young puppies generally need about half a cup of water every two hours, and weaned puppies need about half an ounce to one ounce per pound of body weight per day. Keep water available during the day; during house training, many owners pick it up two to three hours before bedtime.
Is it bad if my dog drinks a lot of water?
Not always. Dogs drink more in hot weather, after exercise and on dry food. But a lasting increase, especially with more peeing, can be a sign of conditions such as kidney disease, diabetes, Cushing’s syndrome or a uterine infection, so see your vet if it continues for more than a day or two.
Should I leave water out for my dog all day?
Yes. Healthy dogs should have fresh water available and shouldn’t have it restricted unless a vet advises it. The main exception is house training a puppy, when picking up the water bowl a couple of hours before bedtime can reduce night-time accidents.
How can I tell if my dog is dehydrated?
Look for dry or sticky gums, a dry nose, sunken eyes, lethargy and loss of appetite. Gently lift the skin between the shoulder blades: it should snap back right away. If your dog seems dehydrated, contact your vet promptly.
Sources
- Cornell University College of Veterinary Medicine, Richard P. Riney Canine Health Center (Brian Collins, DVM). Polyuria and polydipsia (normal intake 40–60 ml/kg/day; over 100 ml/kg/day is excessive; causes).
- dvm360 (Carl A. Osborne, DVM, PhD, DACVIM). The ins and outs of polyuria and polydipsia in veterinary practice (90 ml/kg/day threshold; medications that increase thirst).
- PetMD (reviewed by Jennifer Larsen, DVM, PhD, DACVN). How much water should a dog drink?
- VCA Animal Hospitals (Weir M, Ruotsalo K, Tant MS). Testing for increased thirst and urination.
- American Kennel Club. Is your puppy drinking enough water?
- American Kennel Club (quoting Jerry Klein, DVM, AKC Chief Veterinarian). Dehydration in dogs: signs, symptoms, treatments.
Written by Jordan Ellis for AppSphere Solutions. Researched against the veterinary sources listed above. See how we research our guides, or browse more pet care guides.