Can Dogs Get Kidney Stones? Symptoms, Treatment & Costs

If you've noticed your dog straining to urinate, producing blood-tinged urine, or seeming unusually lethargic, you may be wondering: can dogs get kidney stones? The short answer is yes. Kidney stones, medically known as nephroliths, are hard mineral deposits that form in one or both kidneys when dissolved minerals in urine crystallize and aggregate. While bladder stones (uroliths) are more commonly discussed in veterinary medicine, kidney stones do occur in dogs and can range from incidental findings that never cause problems to life-threatening obstructions requiring emergency surgery.

According to the Merck Veterinary Manual, urolithiasis (stone formation anywhere in the urinary tract) accounts for a significant percentage of canine urinary disorders. Kidney stones specifically are estimated to represent roughly 1–5% of all urolith cases in dogs, with the majority of stones forming in the bladder instead. However, when nephroliths do cause obstruction or infection, they demand swift veterinary intervention.

What Are Kidney Stones in Dogs?

Kidney stones form when the concentration of certain minerals in urine exceeds the solubility threshold, causing crystals to precipitate and bind together. The most common types of nephroliths in dogs include:

• Struvite (magnesium ammonium phosphate): Often associated with urinary tract infections caused by urease-producing bacteria like Staphylococcus and Proteus. These account for roughly 40–50% of canine uroliths overall.
• Calcium oxalate: The second most common type, representing about 35–40% of submissions to stone analysis labs. These cannot be dissolved medically and often require physical removal.
• Urate (ammonium urate): Particularly common in Dalmatians and English Bulldogs due to genetic defects in uric acid metabolism.
• Cystine: A rarer type linked to an inherited renal tubular transport defect, seen most often in breeds like Newfoundlands, Labrador Retrievers, and English Mastiffs.
• Calcium phosphate and silica: Uncommon, but documented in certain breed lines.

Stones may remain small and asymptomatic (sometimes called "silent stones" discovered on routine X-rays), or they can grow large enough to obstruct the ureter — the tube connecting the kidney to the bladder — causing hydronephrosis (kidney swelling), acute kidney injury, and potentially fatal uremia if untreated.

Symptoms of Kidney Stones in Dogs

Kidney stone symptoms vary dramatically depending on stone size, location, and whether obstruction or secondary infection is present. Many dogs with small, non-obstructing nephroliths show no outward signs at all. When symptoms do appear, they typically fall into two categories:

Which Breeds Are Prone to Kidney Stones?

While any dog can develop nephroliths, certain breeds carry significantly higher risk due to genetic metabolic disorders, body conformation, or predisposition to chronic urinary infections.

How Are Kidney Stones Diagnosed in Dogs?

Diagnosing nephroliths requires a combination of imaging, laboratory work, and stone analysis. Your veterinarian will typically follow a stepwise diagnostic process:

Step 1: Initial Assessment
A physical examination, complete history, and urinalysis form the foundation. The urinalysis evaluates urine pH, specific gravity, crystal type, and presence of blood or bacteria. A urine culture and sensitivity test (cost: $80–$180) identifies any concurrent infection and guides antibiotic selection.

Step 2: Blood Work
A complete blood count (CBC) and serum biochemistry panel ($120–$250) assess kidney function (BUN, creatinine, SDMA), electrolyte balance, and liver function. Elevated BUN and creatinine may indicate kidney damage from obstruction or chronic stone-related inflammation.

Step 3: Imaging

• Abdominal radiographs (X-rays): $180–$400. Most struvite, calcium oxalate, and calcium phosphate stones are radiopaque and visible on plain X-rays. Urate and cystine stones are often radiolucent and may not appear.
• Abdominal ultrasound: $300–$600. Superior for detecting radiolucent stones, assessing kidney architecture, identifying hydronephrosis, and evaluating the ureters. This is often the gold standard for nephrolith detection.
• CT scan (computed tomography): $800–$1,500. Reserved for complex cases where surgical planning requires precise stone mapping. Typically performed at specialty centers.

Step 4: Stone Analysis
If a stone is retrieved surgically or passed naturally, quantitative analysis ($50–$120 at labs like the Texas A&M Veterinary Urolith Laboratory or the University of Minnesota Urolith Center) determines exact mineral composition. This is essential for tailoring prevention strategies.

Total diagnostic costs typically range from $400–$1,200 for straightforward cases and $1,500–$3,000+ when advanced imaging or specialist consultation is required.

Treatment Options for Kidney Stones in Dogs

Treatment depends on stone type, size, location, whether obstruction is present, and the dog's overall kidney function. Not all kidney stones require removal — asymptomatic, non-obstructing nephroliths may be managed conservatively with monitoring and dietary modification.

Medical Dissolution Details

Struvite stones can often be dissolved using a therapeutic diet (such as Hill's Prescription Diet s/d or Royal Canin SO) combined with a full course of culture-guided antibiotics. The diet works by acidifying urine and reducing magnesium and phosphorus concentration. This approach requires strict compliance — no treats or alternative foods outside the prescription diet — and follow-up radiographs every 3–4 weeks to confirm dissolution progress.

Surgical Considerations

When surgery is necessary, the procedure may involve a nephrotomy (incision into the kidney) or pyelolithotomy (removal through the renal pelvis). The surgeon will typically place a ureteral stent or nephrostomy tube in complex cases. Post-operative care includes IV fluids, pain management (opioids like buprenorphine or hydromorphone), and monitoring of kidney values at 24, 48, and 72 hours post-surgery.

Prognosis and Life Expectancy

The prognosis for dogs with kidney stones depends heavily on stone type, whether obstruction occurred, how much kidney damage has accumulated, and whether underlying causes are addressed.

Home Care, Prevention, and Long-Term Management

Whether your dog has been treated for kidney stones or you're managing a conservatively monitored case, long-term home care is critical to preventing recurrence. Urolith recurrence rates range from 20–50% within three years when prevention protocols are not followed.

Daily Management Essentials

• Hydration: This is the single most important factor. Increase water intake by feeding canned/wet food (which contains 70–80% moisture vs. 10% in kibble), adding water or low-sodium broth to meals, and providing multiple fresh water stations. Target urine specific gravity below 1.020 on follow-up urinalyses.
• Prescription diet compliance: If your vet has prescribed a therapeutic diet (Hill's c/d, Royal Canin Urinary SO, Purina Pro Plan UR), feed it exclusively. Even small amounts of off-diet treats can alter urine pH enough to promote crystal formation.
• Frequent urination opportunities: Provide bathroom breaks at least every 4–6 hours during the day. Holding urine for prolonged periods increases mineral concentration and crystal formation risk.
• Monitor urine: Periodically check your dog's urine color. Pale yellow is ideal. Dark, concentrated, or blood-tinged urine warrants a vet call.

Prevention Strategies by Stone Type

• Struvite: Prevent and promptly treat UTIs. Monthly urine checks may be recommended for dogs with recurrent infections. Some dogs benefit from long-term urinary acidifiers (potassium citrate, dosed at 40–75 mg/kg every 12 hours — only under veterinary guidance).
• Calcium oxalate: Avoid excessive calcium supplementation. Feed a diet that promotes neutral-to-alkaline urine (pH 6.5–7.5). Potassium citrate may be prescribed. Avoid high-oxalate treats (spinach, sweet potatoes in large amounts).
• Urate: For Dalmatians and Bulldogs, a low-purine diet (avoiding organ meats, sardines) and allopurinol medication (10–15 mg/kg every 8–12 hours) may be required long-term. The FDA-approved drug ProUric (conditioned gene therapy for Dalmatians) remains under investigation as of 2026.
• Cystine: Low-protein diets, tiopronin (Thiola) at 15–20 mg/kg every 12 hours, and aggressive hydration. Neutering intact males may reduce cystine excretion in hormonally responsive cystinuria (Type III).

Cost of Ongoing Care

Budget realistically for long-term management:

• Prescription diet: $50–$90/month depending on dog size
• Recheck urinalysis + imaging: $150–$350 per visit, recommended every 3–6 months
• Urine culture (if recurrent UTIs): $80–$180 per culture
• Medications (allopurinol, potassium citrate, Thiola): $20–$100/month depending on drug and dog weight
• Emergency visit for obstruction or acute episode: $1,500–$5,000+

Annual management costs for a dog with a history of kidney stones typically range from $800–$2,500, excluding emergency events. Pet insurance with urinary condition coverage can offset significant portions of these costs, though pre-existing conditions are generally excluded.

Frequently Asked Questions

Can dogs get kidney stones from drinking hard water?

There is no strong evidence linking hard water (high mineral content tap water) directly to kidney stone formation in dogs. The minerals that form stones come primarily from metabolic processes and diet, not water hardness. That said, encouraging more water consumption of any clean, potable source is beneficial because dilute urine reduces crystal formation risk.

Can kidney stones pass on their own in dogs?

Small stones (under 2–3 mm) may occasionally pass through the ureter and be voided during urination, though this can still cause significant pain and ureteral inflammation. Larger stones are unlikely to pass spontaneously and risk causing complete obstruction. Never attempt to "wait out" a suspected obstruction — this is a veterinary emergency.

Are kidney stones the same as bladder stones?

No. Kidney stones (nephroliths) form in the kidney, while bladder stones (cystoliths) form in the bladder. Both are types of uroliths. Bladder stones are considerably more common in dogs. However, kidney stones can migrate into the ureter or bladder, and a dog can have stones in multiple locations simultaneously.

What is the life expectancy of a dog with kidney stones?

Life expectancy varies enormously based on severity. Dogs with small, managed, non-obstructing stones often live a full normal lifespan (10–15+ years depending on breed). Dogs that experience severe obstruction with acute kidney injury may have reduced life expectancy if permanent nephron damage occurs. Dogs that progress to end-stage chronic kidney disease secondary to stone damage typically have a median survival of 6–12 months with supportive care.

Can I give my dog cranberry supplements to prevent kidney stones?

Cranberry supplements (like those containing proanthocyanidins) may help reduce bacterial adhesion in the bladder, potentially lowering UTI risk — which is relevant for struvite stone prevention. However, cranberry does not prevent calcium oxalate, urate, or cystine stones, and some cranberry products can actually acidify urine excessively. Consult your veterinarian before starting any supplement, and look for products with standardized PAC content (e.g., Vetriscience Bladder Strength or Nutramax Cosequin Advanced with cranberry).

How quickly do kidney stones form in dogs?

Struvite stones can form remarkably quickly — sometimes within 2–4 weeks in the presence of a urease-producing UTI. Calcium oxalate and cystine stones tend to develop more slowly, over months to years. This is why prompt UTI treatment and regular urinalysis screening are so important for at-risk breeds.

This article is intended for educational purposes and does not replace professional veterinary advice. Always consult your veterinarian for diagnosis and treatment of kidney stones or any urinary condition in your dog. If you suspect your dog has ingested a toxic substance, contact the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies).