Bladder stones in dogs are hard mineral deposits that develop inside the urinary bladder. They can cause blood in the urine, frequent urination, straining and discomfort. Some stones can be dissolved with a veterinary-prescribed diet, while others need to be physically removed. If a stone blocks the flow of urine, the condition becomes a life-threatening emergency.

Discovering that your dog has bladder stones can be worrying, particularly when they appear uncomfortable or struggle to urinate. Fortunately, many dogs recover well following appropriate treatment. Understanding the type of stone involved is essential because different stones require different approaches to treatment and prevention.

This guide explains the symptoms, causes, inherited risks, susceptible breeds, treatment options and possible outcomes of bladder stones in dogs.

What Are Bladder Stones in Dogs?

Bladder stones, medically known as cystoliths, are solid deposits formed from minerals and other substances present in urine.

They develop when conditions within the bladder allow certain minerals to become concentrated and form crystals. Over time, these crystals may combine and grow into stones.

Stones can vary considerably in size and number. Some dogs develop numerous small stones, while others have one or two larger deposits.

Although stones may form elsewhere in the urinary tract, including the kidneys and urethra, bladder stones specifically develop within the urinary bladder.

They can irritate the bladder lining and sometimes move into the urethra, the tube through which urine leaves the body.

A stone that obstructs the urethra can prevent normal urination and requires immediate veterinary treatment.

What Are the Symptoms of Bladder Stones in Dogs?

Common symptoms of bladder stones in dogs include blood in the urine, repeated attempts to urinate, passing small amounts of urine and discomfort while toileting.

Some dogs have few obvious symptoms initially, especially when stones are small and do not obstruct urine flow.

Early Signs of Bladder Stones

Owners may notice:

• Blood-tinged, pink or unusually dark urine.
• More frequent requests to go outside.
• Repeated squatting or lifting a leg to urinate.
• Passing smaller amounts of urine than usual.
• Straining or appearing uncomfortable while urinating.
• Accidents indoors despite normal toilet training.
• Excessive licking around the genital area.
• Restlessness or discomfort around the lower abdomen.

These signs can also occur with urinary tract infections and other bladder conditions. Veterinary testing is needed to identify the cause.

What Are the Signs of a Urinary Blockage?

A dog with a urinary obstruction may repeatedly attempt to urinate but produce little or no urine.

As the blockage continues, the dog may develop severe pain, vomiting, weakness or collapse.

If your dog is straining but cannot pass urine, seek emergency veterinary care immediately. Do not wait to see whether the problem resolves on its own.

What Causes Bladder Stones in Dogs?

Bladder stones form when the chemical conditions within urine favour the development and growth of particular minerals.

Several factors can contribute to this process.

Urinary Tract Infections

Some bacteria produce an enzyme called urease, which changes urine chemistry and encourages the formation of struvite stones.

In dogs, most struvite bladder stones develop in association with bacterial urinary tract infections.

Not every urinary infection causes stones, and not every stone is associated with infection.

Concentrated Urine and Hydration

When urine becomes concentrated, minerals may be present at levels that make crystal formation more likely.

Water intake and urine production are therefore important considerations in both treatment and prevention.

Diet and Metabolic Conditions

Diet can influence urine concentration, mineral content and acidity.

However, bladder stones are not simply caused by eating too much of one ingredient. Their development is usually more complex.

Some dogs also have metabolic conditions that increase the amount of calcium, uric acid or other substances excreted into urine.

Genetics and Individual Susceptibility

Inherited differences in metabolism or kidney function can make certain dogs more likely to develop particular stone types.

What Types of Bladder Stones Do Dogs Get?

There are several types of canine bladder stones, each with different causes and treatment requirements.

Struvite Stones

Struvite stones contain magnesium, ammonium and phosphate.

In dogs, they are usually associated with bacterial urinary tract infections. Many can be dissolved using a specially formulated prescription diet alongside appropriate treatment of the infection.

Calcium Oxalate Stones

Calcium oxalate stones are another common type.

They are associated with several factors, including genetic susceptibility and conditions that increase calcium excretion in urine.

Unlike struvite stones, calcium oxalate stones cannot be dissolved using dietary treatment and generally require physical removal when intervention is necessary.

Urate Stones

Urate stones are associated with abnormalities in uric acid metabolism or certain liver and blood-vessel disorders.

Dalmatians have a particularly well-recognised inherited predisposition.

Some urate stones can be dissolved through carefully managed medication and dietary treatment.

Cystine Stones

Cystine stones form when an inherited or otherwise influenced defect in kidney transport causes excessive cystine to enter the urine.

Some affected dogs respond to specialised dietary and medical treatment, although recurrence can be challenging.

Bladder Stone Types in Dogs: Causes and Treatment

These are general treatment patterns. The safest approach depends on the dog's symptoms, stone size, risk of obstruction and confirmed or suspected stone composition.

Are Bladder Stones in Dogs Hereditary?

Some forms of bladder stone disease have a clear genetic component.

Dalmatians have an inherited abnormality in uric acid handling that increases their risk of urate stones.

Cystinuria, which predisposes dogs to cystine stones, also has inherited forms affecting several breeds.

Calcium oxalate stones show strong breed associations, although inheritance is more complex and environmental or metabolic factors also contribute.

There is no single genetic test that predicts every type of bladder stone in every dog.

Responsible breeders should consider relevant family history and breed-specific screening recommendations.

Which Dog Breeds Are Most Prone to Bladder Stones?

Any dog can develop bladder stones, but certain breeds are more susceptible to particular mineral types.

Dalmatians

Dalmatians are particularly associated with urate stones because of inherited differences in uric acid metabolism.

Miniature Schnauzers

Miniature Schnauzers have a recognised predisposition to calcium oxalate stones, particularly during middle and older age.

English and French Bulldogs

Some Bulldogs have inherited forms of cystinuria that increase their susceptibility to cystine stones.

Our guide to common health problems in French Bulldogs

Other Susceptible Breeds

Yorkshire Terriers, Shih Tzus, Bichon Frises, Chihuahuas and Lhasa Apsos are among the smaller breeds associated with calcium oxalate stones.

For broader everyday health advice, see our guide to looking after a Chihuahua.

Breed susceptibility does not mean that an individual dog will necessarily develop stones.

How Do Vets Diagnose Bladder Stones in Dogs?

Diagnosis begins with a physical examination and questions about urinary symptoms, diet, previous infections and medical history.

Urine Testing

Urinalysis can identify blood, inflammation, urine concentration and changes in acidity.

A urine culture may be recommended to identify bacterial infection and guide antibiotic selection.

Finding crystals in urine does not automatically prove that bladder stones are present, and stones can exist without detectable crystals.

X-rays and Ultrasound

Abdominal X-rays can reveal many bladder stones, particularly those containing calcium.

Ultrasound can help identify stones that are difficult to see on standard X-rays and assess the bladder wall.

Stone Analysis

When stones are removed or passed, laboratory analysis can identify their mineral composition.

This is particularly important for selecting an appropriate prevention plan.

How Are Bladder Stones in Dogs Treated?

Treatment depends on the stone type, size, symptoms and whether urine can pass normally.

Prescription Dissolution Diets

Many struvite stones can be dissolved with a specially formulated veterinary diet.

When bacterial infection is involved, appropriate antibiotics are also needed.

Dissolution commonly takes several weeks and requires follow-up imaging to confirm that stones are shrinking.

Not every dog is suitable for medical dissolution, particularly when a stone poses a significant risk of obstruction.

Surgery and Minimally Invasive Removal

Stones that cannot be dissolved may need removal.

Traditional surgery involves opening the bladder to remove stones, a procedure called cystotomy.

Depending on stone size and available facilities, minimally invasive techniques such as cystoscopy, laser lithotripsy or flushing small stones from the bladder may be alternatives.

The ACVIM consensus recommendations favour minimally invasive removal when appropriate.

Emergency Treatment for Urinary Obstruction

If a stone blocks the urethra, the vet must restore urine flow urgently.

This may involve stabilising the dog, managing dangerous electrolyte changes, placing a urinary catheter and removing or repositioning the obstruction.

Delaying treatment can result in serious kidney injury, dangerous changes in blood potassium and potentially death.

Can Dogs Recover Fully From Bladder Stones?

Yes. Many dogs recover well once their stones are successfully dissolved or removed and any associated infection is treated.

Some dogs return to normal urinary habits without further problems.

However, recurrence is possible, especially with calcium oxalate, urate and cystine stones.

Repeated episodes may require long-term dietary management, monitoring and investigation of underlying metabolic disorders.

Possible complications include urinary obstruction, repeated infection, bladder inflammation and, in severe cases, kidney injury.

Early treatment generally improves the outlook and reduces the likelihood of serious complications.

What Should Dogs With Bladder Stones Eat?

There is no single diet suitable for every dog with bladder stones.

Dietary recommendations depend on the stone's mineral composition and the dog's other medical conditions.

Prescription diets may adjust mineral content, urine acidity and other nutritional factors to help dissolve certain stones or reduce recurrence.

Increasing water intake can help dilute urine. Your vet may recommend wet food, adding water to suitable meals or other hydration strategies.

Do not attempt to change urine acidity using home remedies or supplements without veterinary guidance. An approach intended for one stone type may increase the risk of another.

Maintaining a healthy body condition also supports general wellbeing. Our guide to keeping a Labrador at a healthy weight

How Can You Prevent Bladder Stones Returning?

Prevention focuses on reducing the conditions that allowed the original stones to form.

Useful measures include:

• Following a veterinary-recommended diet suited to the confirmed stone type.
• Providing constant access to fresh drinking water.
• Encouraging regular opportunities to urinate.
• Treating urinary tract infections promptly and appropriately.
• Attending recommended urine tests and imaging appointments.
• Managing underlying metabolic conditions where present.

For infection-related struvite stones, preventing or identifying recurring infection may be more important than maintaining a lifelong prescription diet.

For calcium oxalate stones, recurrence can remain a concern despite careful management.

When Are Bladder Stones in Dogs an Emergency?

A dog that cannot urinate normally needs immediate veterinary attention.

Repeated straining with little or no urine, severe discomfort, vomiting, weakness or collapse may indicate urinary obstruction.

Male dogs can be particularly vulnerable because their longer, narrower urethra may become blocked by stones.

Do not wait overnight or attempt home treatment if your dog cannot pass urine.

For other important warning signs, read our guide to medical conditions in dogs and their warning signs.

Frequently Asked Questions About Bladder Stones in Dogs

Can Bladder Stones in Dogs Dissolve Naturally?

Some stones, particularly struvite stones, can be dissolved using a specific veterinary-prescribed diet and appropriate treatment of any associated infection. Calcium oxalate stones cannot be dissolved through diet.

Are Bladder Stones Painful for Dogs?

Yes. Bladder stones can irritate the bladder lining and cause discomfort during urination. Stones that obstruct urine flow can cause severe pain and a life-threatening emergency.

Can Dogs Pass Bladder Stones on Their Own?

Very small stones may occasionally pass in urine, but they can also become trapped in the urethra. Never rely on spontaneous passage without veterinary assessment.

Do All Dogs With Bladder Stones Need Surgery?

No. Some stones can be dissolved medically, and others may be removed using minimally invasive techniques. Surgery remains appropriate for certain cases.

Can Bladder Stones Come Back After Surgery?

Yes. Removing stones does not necessarily remove the underlying cause. Stone analysis, appropriate dietary management and regular monitoring can help reduce recurrence.

Are Bladder Stones More Common in Male or Female Dogs?

The pattern depends on stone type. Infection-related struvite stones are commonly seen in female dogs, while some calcium oxalate, urate and cystine stones are more frequent in males. Male dogs are also at greater risk of urethral obstruction.

Can Supplements Prevent Bladder Stones?

No general pet supplement has been proven to prevent every type of bladder stone. Prevention requires an individual plan based on stone composition, urine findings and any underlying medical conditions.

Final Thoughts

Bladder stones in dogs are often treatable, and many affected dogs return to comfortable, normal lives following appropriate veterinary care.

The key is identifying the stone type, choosing the correct treatment and taking steps to reduce recurrence.

Blood in the urine, frequent urination and discomfort should prompt veterinary advice. If your dog is unable to pass urine, seek emergency treatment immediately.

This article provides general educational information and does not replace individual veterinary diagnosis, treatment or emergency care.