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Complete Guide to Canine Urinary Tract Stones: Prevention, Diet, Symptoms, Causes, Diagnosis, Treatment, and Management

UrinaryDiseasesMeongsiljang Veterinary Advisory Board

Urinary tract stones in dogs are a condition where stones form in the urinary tract, with struvite and calcium oxalate stones being the most common. Preventive diet and early diagnosis are key.

Urinary tract stones in dogs are a condition in which stones form in the urinary tract

A dog experiencing discomfort due to urinary tract stones

Urinary tract stones in dogs are a condition in which hard, stone-like masses form within the urinary tract, including the kidneys, bladder, and urethra. The most common types are struvite, calcium oxalate, urate, and cystine stones. In dogs, struvite and calcium oxalate stones account for more than 70% of all cases. These stones can obstruct or irritate the urinary tract, causing difficulty urinating and severe pain. Struvite stones, in particular, are closely linked to urinary tract infections. When urine becomes supersaturated or its pH shifts to a level that favors stone formation, crystals can develop easily, making adequate hydration and dietary management essential. Early detection and prevention are key, so attentive care from pet owners is vital.

The main causes of urinary tract stones are infection and diet

The main causes of urinary tract stones are urinary tract infections and an unbalanced diet. Struvite stones form when bacteria that break down urea make the urine alkaline, which is closely linked to infection. Calcium oxalate stones are associated with high-oxalate food intake, insufficient water consumption, and genetic predisposition. Additionally, concentrated urine increases the risk of stone formation. Therefore, increasing water intake and proper dietary management are key to prevention. Regular check-ups are also important.

Crystals in the urine that cause urinary tract stones

The main symptoms of urinary tract stones are difficulty urinating and pain

The main symptoms of urinary tract stones in dogs include pain during urination, frequent attempts to urinate, decreased urine volume, blood in the urine, and sudden interruption of urination. In severe cases, dogs may be unable to urinate and may lick their lower back or abdomen or assume a painful posture. Struvite stones are particularly common in female dogs, while calcium oxalate stones are more prevalent in small breeds such as Miniature Schnauzers, Miniature Poodles, Yorkshire Terriers, Lhasa Apsos, Bichon Frises, and Shih Tzus. If symptoms appear, consult a veterinarian immediately. Early detection is key to successful treatment.

Signs of discomfort in dogs suffering from urinary tract stones

Emergency signs requiring immediate veterinary care

If your dog is unable to urinate at all, shivering, or assuming a painful posture, you should seek veterinary care immediately. This could indicate a complete urinary tract obstruction, which can be life-threatening. Struvite stones, in particular, can cause sudden pain and frequent urination, making early diagnosis essential. At the clinic, your vet will use ultrasound or X-rays to confirm the diagnosis and may perform surgery or endoscopic treatment if necessary.

Diagnosis is confirmed through urinalysis and imaging

Diagnosing urinary tract stones involves urinalysis, ultrasound, X-rays, or contrast-enhanced urography. While the presence of crystals in the urine doesn’t definitively confirm stones, it helps estimate the type of stone involved. Crystals often exhibit characteristic shapes that aid in identification. However, since most stones aren’t detectable through physical examination alone, abdominal imaging such as X-rays or ultrasound is essential for confirming the diagnosis. Ultrasound is particularly useful for assessing the size, location, and any obstruction caused by the stones. The veterinarian will make a diagnosis by combining the patient’s medical history with the test results.

An ultrasound image taken to diagnose urinary tract stones in a dog

Treatment methods vary depending on the type of stone

The treatment approach depends on the type and size of the stones. - Struvite stones: These can often dissolve naturally through dietary acidification and antibiotics to eliminate infection. - Calcium oxalate stones: Because they are difficult to dissolve with medication, endoscopic surgery or ultrasonic lithotripsy is typically used. - Post-removal care: Ongoing dietary management and adequate hydration are essential to prevent recurrence. - Veterinary-tailored treatment: A treatment plan is developed based on your pet’s weight, overall health, and stone type. - Diet for recurrence prevention: Options may include acidifying diets, increased water intake, and avoiding high-oxalate foods. Regular check-ups remain important even after treatment.

Surgical procedure for removing urinary tract stones

Home care focuses on dietary management and hydration

To prevent the recurrence of urinary stones, home care focuses on dietary management and adequate hydration. To prevent struvite stones, choose an acidifying diet, while for calcium oxalate stones, avoid foods high in oxalates. Ensure your pet drinks plenty of water daily, and offering wet food can also help. Additionally, monitor their condition through regular urinalysis and veterinary check-ups. Consistent care helps reduce the risk of recurrence.

A scene showing a puppy drinking water and eating to help prevent urinary tract stones.

Certain breeds are at higher risk for urinary tract stones

Miniature Schnauzers, Miniature Poodles, Yorkshire Terriers, Lhasa Apsos, Bichon Frises, and Shih Tzus are breeds prone to urinary tract stones. Specifically, Miniature Schnauzers, Miniature Poodles, Yorkshire Terriers, Lhasa Apsos, Bichon Frises, and Shih Tzus may be susceptible to calcium oxalate stones, while Miniature Schnauzers, Bichon Frises, Cocker Spaniels, and Miniature Poodles require particular attention to struvite stones. Additionally, Dalmatians and English Bulldogs have a high risk of urate stones. For these breeds, regular check-ups and dietary management in consultation with your veterinarian are essential.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can urinary tract stones in dogs be completely cured?

After stone removal, proper care and dietary management can prevent recurrence. However, some breeds have a higher risk of recurrence, so ongoing monitoring is essential.

How should I choose a preventive diet for my pet at home?

Choose a special diet recommended by your veterinarian, and avoid foods high in oxidants. Feeding wet food can also be helpful.

Is surgery always necessary when urinary stones develop?

It depends on the size and location of the stone. Small stones can sometimes be dissolved with medication or a special diet, but if they cause a blockage, surgery is necessary.

Is it dangerous if my dog can't urinate?

This is very dangerous. A blocked urinary tract can lead to kidney damage or sepsis, so immediate veterinary care is essential.

Can stones still form even if my pet is on a preventive diet?

Yes, if other factors such as genetic predisposition or infection are involved, a preventive diet alone may not be sufficient. Regular check-ups are important.

Comparison Table of Preventive Diets for Urinary Tract Stones

Item	Main Ingredients	Suitable Breeds	Precautions
Struvite-Prevention Diet	Acidifying ingredients, low phosphorus, low magnesium	Miniature Schnauzer, Bichon Frise, Cocker Spaniel, Miniature Poodle	Use caution if an infection is present
Calcium Oxalate-Prevention Diet	High moisture, increased water intake, canned (wet) food	Miniature Schnauzer, Miniature Poodle, Yorkshire Terrier, Lhasa Apso, Bichon Frise, Shih Tzu	Must ensure adequate water intake
General Urinary Health Diet	Balanced control, high moisture content	All breeds	Regular checkups needed

Choose after consulting with your veterinarian. Dietary changes should be made gradually.

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References

[1] Clinical Medicine of the Dog and Cat, 4th Ed, Chapter 13: Nephrology/Urology, 2020

[2] Notes on Canine Internal Medicine, 4th Ed, 2019

[3] Fundamentals of Veterinary Clinical Pathology, 3rd Edition, 2021