Dog Excessive Thirst and Urination: What the Vet Will Do and Costs

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Excessive thirst (polydipsia) and urination (polyuria) in dogs are common presenting complaints that necessitate a thorough veterinary workup, as the signs alone are not diagnostic.
• Emergency situations require immediate veterinary attention and include signs such as vomiting, lethargy, abdominal pain, straining to urinate with no output, or collapse, which can indicate acute kidney failure, bladder obstruction, or diabetic complications.
• Initial diagnostic steps typically involve a detailed history, physical examination, complete blood count (CBC), blood chemistry panel (evaluating kidney values like creatinine and BUN, blood glucose, and electrolytes), and urinalysis to assess urine concentration, presence of sugar, protein, and signs of infection.
• Common differential diagnoses for polydipsia and polyuria include diabetes mellitus, chronic kidney disease, Cushing's disease (hyperadrenocorticism), and urinary tract infections, with further testing like urine culture, abdominal ultrasound, or specific hormone assays often required for definitive diagnosis.
• Owners should prepare for the veterinary visit by measuring water intake, tracking urination frequency, noting any other clinical signs, and bringing a list of current medications and supplements; restricting water intake before the visit is contraindicated and potentially dangerous.
• Diagnostic costs can range from $150-$400 for an initial exam with basic bloodwork and urinalysis, potentially escalating to $500-$1500 or more with additional tests such as ultrasound, urine cultures, or hormone panels, with estimates always recommended upfront.

If your dog is drinking more water than usual and needing to go out more often, you are right to pay attention. This combination of signs, called polydipsia (excessive thirst) and polyuria (excessive urination), is one of the most common reasons dogs see a veterinarian. The good news is that many causes are treatable, especially when caught early. The harder news is that the signs alone do not tell us what is wrong, so a proper workup is needed.

First, check for emergencies. If your dog is also vomiting, lethargic, has a swollen or painful belly, is straining to urinate with little or no urine coming out, or cannot keep water down, do not wait for an appointment. Go to an emergency veterinary hospital now. These signs can point to kidney failure, a blocked bladder, or diabetes complications that can turn dangerous within hours. If your dog is a female who has not been spayed, excessive thirst and urination can also signal a life-threatening uterine infection called pyometra, which requires urgent surgery.

For most dogs, however, this problem develops gradually and is not an immediate crisis. You still need a veterinary visit, but you likely have time to book a regular appointment. This article explains what the vet will do, what tests are likely, and what the visit may cost.

Is This an Emergency?

Use this table to decide how quickly to act. When in doubt, call your vet or an emergency hospital and describe exactly what you see.

{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to emergency vet now",
   "signs": [
    "Straining to urinate with no urine produced, or only drops, vomiting, collapse, weakness, pale or muddy gums, belly that is painful or feels tight, rapid breathing at rest, drinking so much that water is vomited back up, known or suspected toxin exposure"
   ],
   "action": [
    "Do not wait",
    "Call ahead if you can, then go immediately"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "Drinking and urinating noticeably more for 1 to 2 days, accidents in the house in a previously housetrained dog, increased appetite with weight loss, cloudy or bloody urine, urinating small amounts very frequently, a female dog that is unspayed and drinking more"
   ],
   "action": [
    "Call your regular clinic first thing in the morning",
    "Ask if they have any same-day slots"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for a defined period",
   "signs": [
    "A single day of slightly increased thirst after heavy exercise, hot weather, or a salty treat, no other signs, water intake returns to normal within 24 hours"
   ],
   "action": [
    "Measure water intake for 24 hours",
    "If the increase continues past that, book an appointment"
   ]
  }
 ]
}

A reliable way to measure water intake is to fill a bowl with a known amount, note the level, and check it at the same time the next day. A dog normally drinks about 30 to 60 milliliters per kilogram of body weight per day, but that range varies widely. What matters more is a change from your dog's own baseline.

What Is Most Likely Going On?

The most common causes of excessive thirst and urination in dogs fall into a few groups. Your vet will consider these based on your dog's age, breed, sex, and other signs.

Diabetes mellitus is common in middle-aged and older dogs. The body cannot use sugar properly, so sugar spills into the urine and pulls water with it. Dogs with diabetes often eat more but lose weight, and their urine may attract ants.

Kidney disease becomes more likely in senior dogs. The kidneys lose their ability to concentrate urine, so the dog produces large volumes of dilute urine and drinks to keep up.

Cushing's disease (hyperadrenocorticism) happens when the adrenal glands make too much cortisol. Dogs with this condition drink and urinate more, develop a pot-bellied look, lose hair, and may pant more.

Urinary tract infections can cause frequent urination, but usually in small amounts. If the infection is severe, it can also increase thirst.

Diabetes insipidus is a rare condition where the brain or kidneys fail to regulate water balance. These dogs drink enormous amounts and produce huge volumes of very dilute urine.

Other possibilities include liver disease, high calcium levels, certain medications like steroids, and hormonal imbalances. The MSD Veterinary Manual Pet Owner Version explains that many of these conditions share the same early signs, which is why testing is essential.

What the Vet Will Ask You First

Your vet will start with a detailed history. Be ready to answer questions about when the increased drinking started, how much your dog drinks in a day, how often your dog urinates, whether accidents happen at night, what your dog eats, and what medications your dog takes. Bring a urine sample if you can. Collect it in a clean container during the morning walk, and keep it refrigerated until you leave for the clinic.

The physical exam comes next. The vet will check your dog's weight, feel the abdomen for an enlarged bladder or kidneys, look at the gums for hydration, and listen to the heart and lungs. This exam is quick but gives important clues.

The Core Tests: Bloodwork and Urinalysis

The first round of testing almost always includes a complete blood count, a blood chemistry panel, and a urinalysis. These three tests together give a broad picture of organ function.

The blood chemistry panel measures kidney values like creatinine and BUN, liver enzymes, blood sugar, calcium, and protein levels. The complete blood count checks for infection or anemia. The urinalysis looks at urine concentration, sugar, protein, blood, and signs of infection.

These tests can often distinguish between diabetes, kidney disease, and a urinary tract infection. If those come back normal or unclear, your vet may recommend further testing. The American Veterinary Medical Association advises pet owners to ask their veterinarian to explain what each test is looking for and why it is recommended, so you understand the plan before it proceeds.

Additional Tests and What They Cost

If the first round does not give a clear answer, your vet may suggest more specific tests. A urine culture identifies which bacteria are causing an infection and which antibiotics will work. An abdominal ultrasound lets the vet see the kidneys, bladder, adrenal glands, and other organs in detail. Hormone tests for Cushing's disease or thyroid problems may be needed.

Costs vary widely by region and clinic. As general context, a basic exam with bloodwork and urinalysis often falls in the range of $150 to $400. Adding a urine culture, ultrasound, or hormone panels can push the total to $500 to $1,500 or more. These are not quotes. Your clinic can give you an itemized estimate before testing begins, and many offer payment plans. The American Animal Hospital Association recommends asking for that estimate upfront so there are no surprises.

What to Prepare Before the Visit

Write down the date you first noticed the change. Count how many times your dog urinates in a day, and note if it happens at night. Measure water intake for 24 hours if possible. Bring a fresh urine sample and a list of all medications and supplements. Bring your dog's vaccination record if you have it.

Most importantly, do not restrict your dog's water before the visit. A dog that is drinking excessively needs that water to stay hydrated. Let your dog drink freely until the vet tells you otherwise.

What You Can Safely Do at Home Right Now

Before you call the vet, there are a few things you can do that are genuinely helpful and safe. None of these replace an examination, but they give your veterinarian better information and can save you time.

Measure water intake. Fill a bowl with a known amount of water, for example 2 cups, in the morning. Let your dog drink normally all day. At the same time the next morning, measure what is left. Subtract that from what you started with. That is your dog's daily water intake. A normal dog drinks about 1 ounce of water per pound of body weight per day, though this varies with activity, weather, and diet. Write down the number.

Track urination frequency. Count how many times your dog urinates in 24 hours. Note whether the urine is pale, clear, dark, or bloody. Note if your dog strains, cries, or produces only a few drops. If your dog is straining to urinate and producing little or no urine, that is an emergency. Seek in-person emergency care immediately.

Check for other signs. Write down any changes in appetite, weight, vomiting, diarrhea, or energy level. If your dog is a female and not spayed, note the date of her last heat cycle. If your dog is on any medication, including flea, tick, or heartworm products, write down the names and doses.

Do not restrict water. A dog that is drinking more than usual needs that water. Limiting water can cause dehydration, especially if the cause is diabetes, kidney disease, or Cushing's disease. Let your dog drink freely until the vet tells you otherwise.

Do not give any medication. Do not give human drugs, herbal remedies, or leftover pet medications. Many causes of increased thirst and urination involve hormones, kidneys, or blood sugar. The wrong medication can be dangerous or even fatal. Dosing must come from the treating veterinarian, and only after a diagnosis.

Do not change the diet. Unless your vet has already told you to, do not switch foods. Some conditions need specific diets, but guessing can delay proper treatment.

What to Write Down Before You Call

Your veterinarian will ask questions. Having answers ready makes the visit faster and more useful. Write down:

• How much water your dog drinks per day, if you can measure it
• How many times your dog urinates per day and night
• Whether your dog has accidents in the house or wakes up to urinate
• When the problem started, as best you can recall
• Any changes in appetite, weight, or energy
• Any vomiting, diarrhea, or straining
• All medications and supplements
• Your dog's age, breed, and whether spayed or neutered

Cost Expectation Table and Test Purpose Checklist

Prices vary widely by region and clinic. The ranges below are general context, not quotes. An emergency hospital charges more than a general practice. A specialist charges more than a general practitioner. Ask for an estimate before tests are run.

Test purpose checklist. Use this to understand what each test tells the vet.

• Urinalysis is the first and most important test. It shows if the urine is dilute, which points to kidney disease or hormonal problems. It also shows sugar, which points to diabetes, and protein or blood, which points to infection or stones.
• Blood sugar is checked early. A high reading with dilute urine strongly suggests diabetes.
• Kidney values on bloodwork tell the vet if the kidneys are failing to concentrate urine.
• Thyroid and cortisol tests look for hormonal causes like Cushing's disease or an underactive thyroid.
• A urine culture is done if infection is suspected, because bacteria can hide even when the urinalysis looks normal.

What Drives the Cost Up or Down

The biggest cost factor is how many tests are needed. A young dog with a simple urinary tract infection may need only a urinalysis and a short course of antibiotics. An older dog with multiple signs may need a full blood panel, hormone tests, and imaging. That difference can be hundreds of dollars.

Emergency or after-hours visits cost more. Specialty hospitals cost more. Rural clinics often cost less than urban ones. Some clinics offer wellness packages or senior panels that bundle tests at a lower price. Ask about those.

Another factor is whether the condition is chronic. Diabetes and Cushing's disease require lifelong monitoring, repeat bloodwork, and ongoing medication. Kidney disease may require prescription diets and regular rechecks. These costs continue beyond the first visit.

When an Online Vet Can Help, and When It Cannot

Some situations in this article require hands-on care and must not be handled remotely. If your dog is straining to urinate and producing nothing, that can indicate a life-threatening blockage. If your dog is vomiting, lethargic, and drinking excessively, that can indicate kidney failure or diabetic complications. If your dog collapses, has seizures, or cannot stand, seek in-person emergency care immediately. Do not use a remote consultation for these.

A remote consultation is genuinely useful for early or mild presentations. If your dog has been drinking slightly more for a few days with no other signs, an online vet can help you decide whether a visit is warranted. They can take a detailed history, look at visible signs on video, and advise on what to monitor. They can also answer questions about medication side effects or follow up on a known chronic condition like diabetes.

What a remote vet cannot do matters. They cannot palpate the abdomen, listen to the chest, take a temperature, run bloodwork, or image anything. They cannot feel a bladder that is too full or kidneys that are too small. They cannot confirm a diagnosis of diabetes, kidney disease, or Cushing's disease without lab results. Prescribing rules differ by state, and a veterinarian may require an in-person examination before prescribing any medication. Use remote care as a triage tool, not a substitute for the tests described above.

Common Mistakes Owners Make With This Problem

When a dog starts drinking and urinating more, owners often react in ways that delay care or muddy the picture. Here is what to avoid and what to do instead.

Waiting to see if it passes. Increased thirst and urination rarely resolve on their own. Many causes, including diabetes and kidney disease, get worse without treatment. If the signs have lasted more than a day or two, call your vet. If your dog is also vomiting, lethargic, or straining to urinate, seek emergency care immediately.

Cutting off water to reduce accidents. This is dangerous. A dog drinking excessively is usually trying to compensate for fluid loss. Restricting water can lead to dehydration and worsen kidney or metabolic problems. Never limit water unless your vet tells you to.

Changing food or treats before the visit. Sudden diet changes can alter test results and make it harder to interpret bloodwork. Keep your dog on their normal food and treats until after the exam.

Giving human medications. Never give your dog over-the-counter or prescription human drugs for thirst or urination. Some can damage kidneys or cause dangerous drops in blood sugar. Dosing must come from your veterinarian.

Hiding accidents out of embarrassment. Tell your vet exactly how much your dog is drinking and how often they urinate, even if it means admitting to carpet stains. That information guides the entire workup.

How to Reduce the Chance of It Happening Again

Some causes cannot be prevented. But you can lower the risk of certain conditions and catch problems earlier.

Keep a healthy weight. Obesity raises the risk of diabetes in dogs. Talk to your vet about your dog's ideal body condition and portion sizes. Regular exercise helps too.

Schedule annual wellness exams. Routine bloodwork and urinalysis can catch early kidney disease or diabetes before signs become obvious. This is especially important for senior dogs. The American Animal Hospital Association recommends regular preventive care visits tailored to your dog's age and risk factors.

Know your dog's normal. Measure how much water your dog drinks over 24 hours once or twice a year. Most dogs drink about 20 to 40 milliliters per kilogram of body weight daily, but individual normal varies. Knowing your dog's baseline helps you spot changes early.

Brush teeth and watch for other signs. Dental disease can contribute to kidney issues over time. Also watch for weight loss, increased appetite, or changes in urine color. Report any combination of these to your vet promptly.

What Recovery and Ongoing Management Usually Look Like

Recovery depends entirely on the cause. Be prepared for the possibility that this becomes a long-term condition instead of a quick fix.

If the cause is diabetes. Your dog will likely need insulin injections twice daily for life. Most dogs stabilize within two to four weeks of starting treatment, but dose adjustments are common. You will learn to monitor water intake, appetite, and urine output at home. Regular blood glucose checks at the vet are part of the routine. The MSD Veterinary Manual Pet Owner Version explains that diabetes management requires consistent daily care and follow-up.

If the cause is kidney disease. There is no cure, but progression can be slowed. Treatment often includes a special kidney diet, medications to manage nausea and blood pressure, and subcutaneous fluids given at home. Expect rechecks every one to three months. Some dogs live comfortably for years with good management.

If the cause is a urinary tract infection. Antibiotics usually clear the infection within one to two weeks. Your vet will likely want a follow-up urine test to confirm the infection is gone. Recurrence is possible, especially in female dogs or those with bladder stones.

If the cause is Cushing's disease. Medication controls the excess hormone production. Most dogs improve within a few weeks, though dose adjustments are common. Lifelong treatment and periodic bloodwork are needed.

If the cause is a medication side effect. Your vet may adjust the dose or switch drugs. Water intake often returns to normal within days.

If no cause is found. Some dogs simply drink more as they age. Your vet may recommend monitoring and rechecking in three to six months. Keep tracking water intake and urination frequency so you can report changes.

Frequently Asked Questions

How much is too much water for my dog? A general rule is more than 100 milliliters per kilogram of body weight per day. For a 10 kilogram dog, that is about one liter daily. But normal varies by dog, diet, and activity. The more useful question is whether your dog's drinking has increased compared to their own baseline. Measure water for 24 hours and share the number with your vet.

Will my dog need to stay overnight at the hospital? Most dogs do not need hospitalization for a thirst and urination workup. Bloodwork and urinalysis can be done during a regular appointment. Hospitalization is more likely if your dog is severely dehydrated, has diabetic ketoacidosis, or needs IV fluids and close monitoring. Your vet will tell you if overnight care is necessary.

Can I get test results the same day? Many clinics run in-house bloodwork and urinalysis, giving results within an hour or two. Hormone tests like the ACTH stimulation test for Cushing's disease often require sending samples to an outside laboratory, which takes a few days. Ask your vet about turnaround times when you book the appointment.

My dog is elderly. Is testing still worth it? Yes. Senior dogs are more likely to have diabetes, kidney disease, and Cushing's disease, all of which are manageable with treatment. Knowing the cause also helps you make informed decisions about quality of life. The American Veterinary Medical Association encourages regular senior wellness testing to catch problems early.

What if I cannot afford the full workup? Tell your vet your budget openly. Many clinics offer staged testing, starting with the most likely and most affordable tests. Urinalysis and a basic blood panel cover many common causes. Some clinics offer payment plans or can refer you to financial assistance programs. Do not skip testing entirely, as guessing can lead to worse outcomes and higher costs later.

How long until my dog feels better? If the cause is a simple infection, improvement can come within days of starting antibiotics. For diabetes or Cushing's disease, expect several weeks of adjustment before your dog's energy and thirst normalize. Kidney disease improves more slowly and may never fully resolve, but many dogs feel noticeably better once treatment begins.

Related Clinical & Scientific Guides

• Cat Straining to Poop but Only Passing Mucus: Causes and Care
• Cat Upset Stomach: Home Remedies That Are Safe
• Cat Straining to Poop but Nothing Comes Out: Emergency or Not?

References and Further Reading

• MSD Veterinary Manual Digestive Disorders of Dogs and Cats
• AVMA Pet Owner Resources
• MSD Veterinary Manual Pet Owner Version
• AAHA Pet Owner Resources

Related Articles

• Dog Straining to Urinate: What the Vet Will Do and Costs
• Dog Not Drinking Water: What the Vet Will Do and How Much It Costs
• Dog Straining to Poop: What the Vet Will Do and How Much It Costs
• Dog Blood in Stool: What the Vet Will Do and How Much It Costs
• Dog Excessive Thirst and Urination: What It Could Mean

This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.