Why Is My Dog Peeing So Much? Causes, Symptoms, and When To Worry

If your dog is peeing more than usual, it may be a sign of an underlying health issue that should be evaluated by a veterinarian.

You may notice your dog asking to go outside more often, having accidents in the house, or squatting to urinate frequently during walks. These changes can indicate anything from a minor issue to a more serious condition.

Here’s what is considered normal urination for dogs and the most common reasons your dog may be peeing more than usual.

How Much Should Dogs Pee?

The normal amount a dog urinates depends on factors such as hydration, age, size, and overall health.

Adult Dogs

Healthy adult dogs can typically hold their urine for six to eight hours.

On average, dogs produce about 20–40 milliliters of urine per kilogram of body weight over 24 hours.

For example:

• A 20-pound dog produces about 6–12 ounces per day
• A 45-pound dog produces about 14–28 ounces per day

Puppies

Puppies urinate more frequently because they are still developing bladder control and require more water to stay hydrated.

They should be taken outside every two to six hours, depending on their age.

A general rule: Puppies can hold their urine for about as many hours as their age in months. For example, a 2-month-old puppy can typically hold urine for about two hours

By 6–8 months of age, urination frequency becomes more similar to adult dogs, depending on lifestyle and health.

Senior Dogs

Senior dogs may need to urinate more often due to:

• Underlying medical conditions
• Cognitive dysfunction (forgetting where or when to urinate)

When To See a Vet for Frequent or Excessive Urination in Dogs

Frequent or excessive urination in dogs is not always an emergency, but it should be evaluated by a veterinarian—especially if it persists or worsens.

In many cases, you can schedule a regular veterinary visit. However, seek immediate veterinary care if your dog has increased urination along with any of the following symptoms:

• Vomiting
• Blood in the urine
• Straining to urinate with little or no urine produced
• Lethargy
• Known toxin ingestion
• Not eating for more than 24 hours
• Pus or discharge from the vulva

These signs may indicate a more serious condition that requires urgent treatment.

Why Is My Dog Peeing So Much?

Frequent urination in dogs can be caused by medical conditions, medications, or behavioral factors.

The first step is to rule out medical causes, as many serious conditions can lead to increased urination. Your veterinarian is essential in determining the underlying cause.

Medical Causes of Increased Urination

There are two main patterns of abnormal urination:

• Polyuria: Large amounts of urine
• Pollakiuria: Frequent urination of small amounts

Conditions That Cause Large Amounts of Urine (Polyuria)

Polyuria is often associated with increased thirst and may be caused by:

• Kidney disease or infection: Kidney disease reduces the ability to filter toxins, causing excess urine production. Kidney infections can also lead to increased urination.
• Diabetes mellitus: High blood sugar levels cause excess glucose to be excreted in urine, pulling water with it. Increased thirst and urination are often early signs.
• Diabetes insipidus: This is a rare condition where the body cannot properly regulate water balance due to issues with antidiuretic hormone.
• Cushing’s disease: Overproduction of cortisol leads to increased thirst and urination. Other signs include panting, increased appetite, hair loss, and a pot-bellied appearance.
• Hyperthyroidism (rare in dogs): This is usually caused by thyroid tumors. Symptoms may include weight loss, hyperactivity, vomiting, and increased appetite.
• Pyometra (emergency condition): This is a life-threatening uterine infection in unspayed female dogs. Signs include increased urination, thirst, lethargy, fever, and vaginal discharge.
• Hypercalcemia (high blood calcium): It can cause increased urination along with lethargy, vomiting, and appetite loss.
• Cancer: Certain cancers (especially urinary tract cancers or those affecting calcium levels) can increase urine production.
• Liver infection (leptospirosis): A serious bacterial infection affecting the liver and kidneys, leptospirosis is often spread through contaminated water. Causes increased thirst and urination and can be fatal without treatment.
• Electrolyte imbalances: Abnormal sodium or potassium levels disrupt fluid balance, leading to increased urination.
• Medication side effects: Certain drugs can increase thirst and urination, including:
  • Diuretics (e.g., furosemide)
  • Anti-seizure medications (e.g., phenobarbital)
  • Corticosteroids (e.g., prednisone)
• Psychogenic polydipsia (behavioral): A behavioral condition where a dog drinks excessive water, leading to increased urination. This is diagnosed after ruling out medical causes.

Conditions That Cause Frequent Small Urination (Pollakiuria)

Pollakiuria is often associated with urinary discomfort and may include straining or blood in the urine.

• Bladder infections can cause frequent urination, straining, and sometimes blood in the urine.
• Bladder stones or crystals irritate the urinary tract, leading to urgency, straining, and small urine volumes.
• Bladder cancer may cause frequent urination, difficulty urinating, or incontinence.
• Prostate issues (in male dogs) such as enlargement, infection, or cancer can affect urination and cause:
  • Increased frequency
  • Straining
  • Blood or pus in urine

Non-Medical Reasons That Affect How Much a Dog Pees

Not all cases of increased urination in dogs are caused by medical conditions—environmental and lifestyle factors can also play a role.

Common non-medical factors include:

• Diet: Diets that are low in protein or high in sodium can increase urine production.
• Increased activity: Exercise leads to fluid loss, which increases thirst. The more a dog drinks, the more they will need to urinate.
• Heat: Dogs drink more water in warmer weather, which can result in increased urination.
• Age: Puppies and senior dogs tend to urinate more frequently due to developing or declining bladder control.
• Weather and behavior: Some dogs may hold their urine during stressful conditions like thunderstorms or avoid going outside in rain. When they finally urinate, they may pass a larger volume than usual. 

How Vets Evaluate Excessive Urination in Dogs

Veterinarians evaluate excessive urination in dogs by combining a physical exam with targeted diagnostic testing to identify the underlying cause.

Your vet will begin with a thorough medical history and physical examination to check for signs of pain, illness, or abnormalities. Based on those findings, they may recommend one or more of the following tests:

Basic Laboratory Testing

• Full blood work: Evaluates kidney and liver function, electrolyte levels, and red and white blood cell counts
• Urinalysis: Assesses urine concentration and checks for protein, blood, crystals, bacteria, and white blood cells

Urinary Tract Evaluation

• Urine culture and sensitivity: Identifies bacterial infections and determines the most effective antibiotic
• Abdominal X-rays: Detect stones, tumors, uterine enlargement (such as with infection), or prostate changes
• Abdominal ultrasound: Provides detailed imaging of the kidneys, bladder, ureters, prostate, uterus, liver, adrenal glands, and other organs

Advanced or Targeted Testing

• Cadet BRAF urine test: Screens for transitional cell carcinoma (bladder cancer)
• Calcium testing: Detects hypercalcemia (elevated calcium levels)
• ACTH stimulation test: Helps diagnose Cushing’s disease

These tests help your veterinarian determine whether excessive urination is caused by a medical condition, hormonal imbalance, infection, or structural abnormality, allowing for more targeted treatment.

Treatments for Excessive Peeing in Dogs

Treatment for excessive urination in dogs depends on the underlying cause.

Once your veterinarian identifies the reason for increased urination, treatment will be tailored to that condition.

Behavioral and Medication-Related Causes

• Psychogenic polydipsia (increased thirst): Treatment typically involves controlled water intake after all medical causes have been ruled out.
• Medication side effects: Increased urination from medications often improves within one to two weeks as the body adjusts. If symptoms persist, your veterinarian may adjust the dosage.

Infections

• Kidney or urinary tract infections (UTIs): Treatment usually includes:
  • Antibiotics
  • Pain management
  • Sometimes probiotics
• Prostatitis (in male dogs): Typically treated with antibiotics and pain medications.
• Liver infection (leptospirosis): Often requires hospitalization, including:
  • Intravenous antibiotics
  • Fluid therapy
  • Gastroprotective medications

Hormonal and Metabolic Conditions

• Diabetes mellitus: Managed primarily with insulin therapy. Severe cases may require hospitalization for complications such as diabetic ketoacidosis.
• Cushing’s disease: Usually treated with trilostane, a medication that reduces cortisol production.
• Electrolyte imbalances: Treatment depends on the cause and may include:
  • Fluid therapy
  • Hospitalization (in severe cases)
  • Dietary adjustments

Organ Disease

• Kidney failure: Treatment depends on disease stage and may include:
  • Fluid therapy (at home or in hospital)
  • Prescription diets (low phosphorus)
  • Appetite stimulants
  • Blood pressure medications
  • Antibiotics (if infection is present)

Structural Conditions

• Bladder stones or crystals: Some types (e.g., struvite) can be dissolved with prescription diets, while others require surgical removal
• Pyometra (uterine infection): Surgical removal of the uterus is the preferred treatment. Antibiotics may be used temporarily, but recurrence is common without surgery

Cancer

Treatment depends on the type and may include:

• Surgery
• Chemotherapy
• Radiation therapy