Dog Drinking and Peeing a Lot: Causes and What to Do

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

If the water bowl needs filling more often and your dog is asking to go out constantly, it is worth paying attention. Increased thirst and urination are among the most useful early signs of illness.

What counts as excessive

Vets often use rough guides: normal drinking is under about 100 ml per kg per day, and drinking above that is worth investigating. Diet matters, since kibble is dry and canned food contains a lot of water. See how much water should a dog drink. Hot weather, exercise and salty snacks can also increase thirst temporarily.

How to measure

1. Fill a measured container in the morning and note the amount.
2. Record what is left after 24 hours, including any topped up.
3. Divide by weight in kilograms to get ml per kg.
4. Repeat for two days and share the numbers with your vet.

Common causes

• Diabetes mellitus. See diabetes in dogs
• Kidney disease. See kidney disease in dogs
• Cushing's disease. See Cushing's disease in dogs
• Urinary tract infection. See urinary tract infections in dogs
• Liver disease. See liver disease in dogs
• Pyometra in unspayed females. See pyometra in dogs
• Medications, including steroids and some diuretics
• High blood calcium and other metabolic problems
• Psychogenic drinking, which is less common and a diagnosis of exclusion

Signs that make it more urgent

• Vomiting or lethargy
• Weight loss or poor appetite
• Pale gums or a swollen belly
• Vaginal discharge in an unspayed female
• Accidents in a house-trained dog
• Sudden onset

What your vet may do

Expect a physical exam and tests such as bloodwork, urinalysis with a culture and possibly ultrasound or hormone testing. Many of the causes are manageable, particularly when found early.

What to avoid

Do not restrict water to reduce accidents, as dehydration can worsen kidney or metabolic disease. Do not give supplements or change diet before tests, since this can complicate results.

Managing in the meantime

1. Provide plenty of fresh water.
2. Offer more frequent toilet breaks, including late at night.
3. Use washable bedding or pads for older dogs.
4. Keep a log of thirst, urination and appetite.
5. Book the vet visit promptly.

Puppies and seniors

Puppies have higher fluid needs than adults, but sudden extreme thirst warrants a check. Seniors are more likely to have underlying disease. See senior dog checkups.

Common mistakes

• Assuming it is just hot weather
• Restricting water
• Waiting months
• Attributing accidents to behavior

Troubleshooting

• My dog drinks more only in summer: check the numbers anyway.
• My dog drinks a lot but eats normally: tests are still needed.
• My dog wakes to urinate at night: mention it to your vet.

A simple plan

1. Measure water intake.
2. Book an exam.
3. Provide tests as advised.
4. Follow treatment.

Real-life examples

A terrier with new thirst is diagnosed with diabetes and thrives on insulin. A senior retriever with increased drinking has early kidney disease managed with diet. An unspayed spaniel is rushed in for pyometra. Early checks matter.

Notice the small changes

Small changes in drinking habits are among the easiest to spot and the most useful to report.

Questions to ask your vet

Ask which tests are most likely to be useful, whether a urine sample should be collected at home, whether fasting is needed before bloodwork and how soon results will be available. Ask what increase in thirst should prompt an urgent call, so you can act quickly if things change.

Keeping a simple diary

Write down water intake, number of toilet trips, accidents and appetite for a week. Add notes about weather, exercise, new foods and medications. Patterns such as night-time urination or sudden changes after a drug are valuable clues, and a diary makes your vet visit far more productive.

The takeaway

Increased thirst and urination are signals, not diagnoses. Measure, avoid restricting water and see your vet.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.