Do Dogs Get Kidney Stones? Symptoms, Treatment & Prevention Guide
Do dogs get kidney stones? Yes. Learn the symptoms, causes, diagnosis costs, treatment options, and prevention strategies for canine nephrolithiasis.
Do Dogs Get Kidney Stones? Understanding Canine Nephrolithiasis
Yes, dogs absolutely get kidney stones. The veterinary term for this condition is nephrolithiasis — the formation of hard mineral deposits within the kidney or renal pelvis. These stones (nephroliths) develop when minerals in the urine become supersaturated and crystallize, eventually clumping into solid masses that can obstruct urine flow, cause infection, or damage kidney tissue.
According to the Merck Veterinary Manual, kidney stones account for a smaller proportion of canine uroliths compared to bladder stones (cystoliths), but they carry higher risk because they directly threaten renal function. Studies published in veterinary urology literature estimate that nephroliths represent roughly 1-5% of all canine urolith submissions analyzed by laboratories. While not the most common urinary condition, they are serious when they occur and require prompt veterinary evaluation.
Kidney stones in dogs differ from bladder stones in a critical way: a bladder stone may cause discomfort and urinary issues, but a kidney stone can compromise the organ responsible for filtering blood, regulating electrolytes, and producing hormones. Left untreated, nephrolithiasis can progress to chronic kidney disease (CKD), hydronephrosis (kidney swelling from blocked urine drainage), or complete kidney failure.
What Are the Symptoms of Kidney Stones in Dogs?
Kidney stones are notoriously difficult to detect at home because many dogs remain asymptomatic until the stones grow large enough to obstruct urine flow or trigger a secondary infection. Some nephroliths are discovered incidentally during abdominal imaging for unrelated conditions. That said, there are recognizable patterns that warrant investigation.
Early Warning Signs (Mild to Moderate)
| Symptom | What You Might Notice | Why It Happens |
|---|---|---|
| Increased thirst (polydipsia) | Drinking noticeably more water than usual, emptying the bowl frequently | Kidneys struggling to concentrate urine; body compensating for fluid loss |
| Increased urination (polyuria) | More frequent bathroom breaks, larger volumes of urine | Reduced kidney concentrating ability |
| Mild lethargy | Less enthusiasm for walks, sleeping more during the day | Low-grade discomfort or early metabolic changes |
| Occasional vomiting | Spitting up food or bile 1-2 times per week | Toxin buildup from reduced kidney filtration |
| Decreased appetite | Leaving food in the bowl, showing less interest in treats | Nausea from uremic toxins |
Advanced Symptoms (Severe — Act Quickly)
| Symptom | What You Might Notice | Urgency Level |
|---|---|---|
| Blood in urine (hematuria) | Pink, red, or brown-tinged urine | ⚠️ Urgent — call vet within 24 hours |
| Straining to urinate (dysuria) | Posturing repeatedly with little output, whimpering while urinating | 🚨 Emergency — possible obstruction |
| Abdominal pain | Flincing when touched near the flank or belly, hunched posture | 🚨 Emergency — may indicate hydronephrosis |
| Complete inability to urinate | Repeated attempts with zero output over 12+ hours | 🚨 Life-threatening emergency |
| Severe vomiting/diarrhea | Multiple episodes in a day, inability to keep water down | 🚨 Emergency — dehydration risk |
| Collapse or weakness | Inability to stand, pale gums, rapid breathing | 🚨 Critical — go to emergency vet immediately |
A key distinction: if your dog is straining to urinate but producing little or no urine, this could indicate a urethral obstruction (more common with bladder stones that have migrated) or a ureteral obstruction (a kidney stone blocking the tube from kidney to bladder). Both are life-threatening emergencies requiring immediate intervention.
Which Breeds Are Prone to Kidney Stones? Risk Factors Explained
While any dog can develop nephroliths, certain breeds, ages, and lifestyle factors significantly increase risk. The American Kennel Club notes that breed-specific mineral metabolism and urinary tract anatomy play major roles.
Risk Factors for Canine Kidney Stones
- Breed predisposition: Lhasa Apsos, Shih Tzus, Yorkshire Terriers, Miniature Schnauzers, Bichon Frises, Cairn Terriers, and Dalmatians show higher rates of urolith formation. Dalmatians are uniquely prone to urate stones due to a genetic defect in uric acid metabolism.
- Age: Middle-aged to senior dogs (6-10 years) are most commonly affected, though puppies with congenital metabolic disorders can develop stones early.
- Sex: Female dogs are more frequently diagnosed with kidney stones than males, though males may face higher obstruction risk due to their narrower, longer urethra.
- Diet: Diets excessively high in certain minerals (calcium, oxalate, purines) or those that produce highly concentrated, acidic, or alkaline urine can promote crystallization.
- Hydration: Dogs with chronically low water intake produce more concentrated urine, increasing mineral supersaturation.
- Recurrent UTIs: Chronic urinary tract infections, particularly with urease-producing bacteria like Staphylococcus or Proteus, create alkaline urine that promotes struvite stone formation.
- Genetic/metabolic conditions: Hypercalcemia (elevated blood calcium), hyperparathyroidism, portosystemic shunts (liver shunts), and Cushing's disease can all predispose dogs to nephroliths.
- Obesity: Overweight dogs show altered mineral metabolism and reduced activity levels that may contribute to stone risk.
Stone Types and Breed Associations
| Stone Type | Composition | High-Risk Breeds | Urine pH Preference |
|---|---|---|---|
| Struvite | Magnesium ammonium phosphate | Miniature Schnauzers, Bichon Frises, Cocker Spaniels | Alkaline (pH > 7.0) |
| Calcium oxalate | Calcium + oxalic acid | Lhasa Apsos, Shih Tzus, Yorkshire Terriers, Keeshonds | Acidic (pH < 6.5) |
| Urate (ammonium urate) | Uric acid salts | Dalmatians, English Bulldogs, dogs with liver shunts | Acidic to neutral |
| Cystine | Amino acid cystine | Newfoundlands, Labrador Retrievers, Dachshunds, English Bulldogs | Acidic (pH < 6.5) |
| Calcium phosphate | Calcium + phosphate | Rare; associated with hyperparathyroidism | Variable |
How Are Kidney Stones Diagnosed in Dogs?
Diagnosing nephrolithiasis requires veterinary imaging and laboratory analysis. Your vet will build a diagnostic picture using several tools, and the process typically unfolds in stages.
Stage 1: Initial Assessment ($150–$350)
Your veterinarian will begin with a thorough physical examination, palpating the abdomen and kidneys for enlargement or pain. They will take a detailed history covering diet, water intake, urination patterns, and any previous urinary issues.
Stage 2: Laboratory Testing ($200–$500)
- Complete blood count (CBC): Checks for infection, anemia, and inflammation. Cost: $80–$150.
- Serum biochemistry panel: Evaluates kidney function markers — blood urea nitrogen (BUN), creatinine, SDMA (symmetric dimethylarginine), calcium, phosphorus, and electrolytes. Elevated BUN and creatinine suggest impaired kidney filtration. Cost: $100–$200.
- Urinalysis with sediment exam: Measures urine specific gravity (concentration), pH, and identifies crystals, blood cells, or bacteria under the microscope. This is critical for determining stone type. Cost: $50–$100.
- Urine culture and sensitivity: If infection is suspected, this identifies the specific bacteria and which antibiotics will work. Cost: $80–$150.
Stage 3: Imaging ($250–$800+)
- Abdominal radiographs (X-rays): Most calcium-based stones (struvite, calcium oxalate) are radiopaque and visible on standard X-rays. Cost: $200–$400 for a two-view abdominal study.
- Abdominal ultrasound: Superior for detecting radiolucent stones (urate, cystine) that don't show on X-rays, and for assessing kidney structure, hydronephrosis, and ureteral dilation. Cost: $300–$600.
- CT scan (computed tomography): The gold standard for mapping stone location, size, and number. Typically reserved for surgical planning. Cost: $800–$1,500+ at specialty centers.
Stage 4: Stone Analysis ($50–$150)
If a stone is retrieved surgically or passed naturally, it should be sent to a laboratory (such as the Gerald V. Ling Urinalysis and Stone Analysis Laboratory at UC Davis or the Minnesota Urolith Center) for quantitative analysis. Knowing the exact mineral composition is essential for designing a prevention plan.
- Basic workup (exam + blood work + urinalysis + X-rays): $600–$1,250
- Comprehensive workup (adds ultrasound, urine culture, CT): $1,400–$3,000+
Can Kidney Stones in Dogs Be Treated? Treatment Options Compared
Treatment depends on the stone type, size, location, whether obstruction is present, and the dog's overall kidney function. There is no one-size-fits-all approach, and your veterinarian will tailor the plan to your dog's specific situation.
| Treatment Approach | Best For | Procedure Details | Success Rate / Outcome | Estimated Cost |
|---|---|---|---|---|
| Medical dissolution | Struvite stones (sometimes urate) | Prescription therapeutic diet (e.g., Hill's s/d, Royal Canin SO) fed exclusively for 4-12 weeks; antibiotics if infection-driven | 60-90% dissolution rate for struvites when protocol is followed strictly; not effective for calcium oxalate or cystine | $80–$200/month (diet + monitoring) |
| Surgical removal (nephrotomy/nephrolithotomy) | Large stones causing obstruction, non-dissolvable stones | Incision into the kidney to extract stones; requires general anesthesia and 2-4 day hospitalization | Effective at removing stones; carries risk of kidney tissue damage; preserves kidney in most cases if done before severe damage | $2,500–$5,000+ |
| Lithotripsy (laser or shockwave) | Small-to-moderate stones in accessible locations | Uses laser energy or extracorporeal shockwaves to fragment stones so they pass naturally; available at specialty centers | Variable — 50-80% success depending on stone type and location; may require multiple sessions | $2,000–$4,500 per session |
| Ureteral stenting / nephrostomy tube | Ureteral obstruction from migrated stones | Placement of a stent to bypass the blockage or a tube to drain the kidney externally | Buys time and relieves obstruction; often a bridge to definitive treatment | $3,000–$6,000 at specialty centers |
| Nephrectomy (kidney removal) | Non-functional, severely damaged kidney | Complete removal of one kidney; only viable if the other kidney is healthy and functional | Dogs can live normally with one healthy kidney; eliminates stone recurrence in the removed kidney | $3,000–$5,500 |
| Supportive / conservative management | Small, non-obstructive, asymptomatic stones | Increased hydration, dietary modification, periodic monitoring with imaging every 3-6 months | Stones may remain stable for years; risk of future obstruction always present | $200–$500/year (monitoring + diet) |
For struvite stones, medical dissolution is often the first-line approach because these stones can actually dissolve with the right combination of therapeutic diet and infection control. The key is strict dietary compliance — even occasional treats or table scraps outside the prescription diet can undermine dissolution by altering urine pH.
For calcium oxalate stones, medical dissolution does not work. These require physical removal if they are causing problems. Prevention of recurrence is the primary long-term strategy, involving dietary modification to reduce urinary calcium and oxalate concentrations while maintaining appropriate urine pH.
What Is the Life Expectancy of a Dog With Kidney Stones?
Prognosis varies enormously based on several factors: whether one or both kidneys are affected, the degree of kidney damage at diagnosis, the stone type, and how quickly treatment begins.
| Scenario | Typical Prognosis | Expected Survival |
|---|---|---|
| Small, non-obstructive stones in one kidney; normal kidney function | Good — managed with monitoring and dietary changes | Normal lifespan possible with consistent management |
| Stones successfully dissolved or surgically removed; no lasting kidney damage | Very good — recurrence risk managed with prevention plan | Normal lifespan expected |
| Unilateral obstruction treated promptly; one healthy kidney remains | Good — remaining kidney compensates | Normal to near-normal lifespan |
| Bilateral kidney involvement; early CKD (IRIS Stage 1-2) | Fair — requires ongoing management of kidney disease | 1-3+ years with proper management, depending on progression rate |
| Advanced kidney failure (IRIS Stage 3-4) from prolonged obstruction or bilateral damage | Guarded to poor | Weeks to several months; quality of life becomes the primary concern |
| Untreated complete bilateral obstruction | Grave — fatal without emergency intervention | Days to 1-2 weeks |
The International Renal Interest Society (IRIS) staging system classifies chronic kidney disease from Stage 1 (mild, creatinine < 1.4 mg/dL in dogs) through Stage 4 (severe, creatinine > 5.0 mg/dL). Dogs diagnosed at Stage 1 or 2 generally have significantly longer survival times than those diagnosed at Stage 3 or 4. Early detection is the single most impactful factor in prognosis.
Home Care, Prevention, and Long-Term Management
Whether your dog has been treated for kidney stones or you want to reduce their risk, daily management practices make a significant difference.
Hydration Strategies
Increasing water intake is the cornerstone of prevention across all stone types. Dilute urine means minerals are less likely to reach supersaturation levels.
- Feed wet/canned food: Canned food contains approximately 70-80% moisture compared to 10% in dry kibble. Switching to or supplementing with canned food significantly increases daily water intake.
- Add water or low-sodium broth: Add 2-4 tablespoons of water or dog-safe low-sodium chicken broth to meals.
- Multiple water stations: Place fresh water bowls in 3-4 locations around the house. Some dogs prefer running water — consider a pet fountain (e.g., Catit Flower Fountain or PetSafe Drinkwell, $25–$50).
- Ice cubes as treats: Many dogs enjoy chewing ice cubes, which provides hydration in a fun format.
- Target urine specific gravity: Your vet can check this — ideally, you want USG below 1.020 for most stone-forming dogs.
Dietary Management by Stone Type
- Struvite: Prescription diets like Hill's c/d Multicare or Royal Canin Urinary SO maintain slightly acidic urine (pH 6.0-6.5) and restrict magnesium, phosphorus, and protein. Preventing UTIs is equally important — struvite stones in dogs are almost always infection-induced.
- Calcium oxalate: Diets that promote neutral-to-slightly-alkaline urine (pH 6.5-7.5) with controlled calcium and oxalate content. Hill's u/d or Royal Canin Urinary SO are commonly prescribed. Avoid high-oxalate treats like spinach, sweet potatoes, and peanut butter.
- Urate: Low-purine diets (Hill's u/d or Royal Canin UC) are essential. Allopurinol medication (5-10 mg/kg every 8-12 hours, as prescribed by your vet) may be needed long-term, especially in Dalmatians.
- Cystine: Low-protein therapeutic diets combined with medications like tiopronin (Cuprimine) or 2-MPG (Thiola, 15-20 mg/kg every 12 hours) that bind cystine in the urine. Neutering intact males can reduce cystine stone recurrence in some breeds.
Monitoring Schedule
| Timeframe | What to Monitor | Frequency |
|---|---|---|
| First 3 months post-treatment | Urinalysis, urine pH, urine culture if applicable | Every 4 weeks |
| 3-12 months post-treatment | Urinalysis + abdominal imaging (X-ray or ultrasound) | Every 3 months |
| Long-term maintenance | Urinalysis, blood work (BUN, creatinine, SDMA), imaging | Every 6 months |
| At home (ongoing) | Water intake, urination frequency, urine color, appetite, energy level | Daily observation |
When to Call the Vet: Emergency Red Flags
🚨 Seek Immediate Veterinary Care If Your Dog Shows:
- No urine output for 12+ hours — this is a life-threatening obstruction
- Repeated straining with minimal urine production — indicates partial or complete blockage
- Visible blood in urine combined with pain, vomiting, or lethargy
- Severe abdominal pain — hunched posture, crying when touched near the belly or flank
- Repeated vomiting with inability to keep water down — dehydration accelerates kidney damage
- Collapse, extreme weakness, or pale gums — suggests systemic crisis
- Known stone-former with sudden behavior change — any acute change in a dog with stone history warrants urgent evaluation
If you suspect toxin ingestion alongside urinary symptoms, contact the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies) or the Pet Poison Helpline at (855) 764-7661.
How Much Does Kidney Stone Treatment Cost in Dogs?
Treatment costs vary widely based on the approach, geographic location, and whether a general practice or specialty center handles the case. Here is a realistic breakdown for 2026 veterinary pricing:
| Cost Category | Low End | Typical Range | High End / Worst Case |
|---|---|---|---|
| Initial diagnosis (exam + labs + imaging) | $600 | $900–$1,800 | $3,000+ (with CT) |
| Medical dissolution (diet + meds + monitoring, 3 months) | $250 | $400–$700 | $1,000+ |
| Surgical stone removal | $2,500 | $3,500–$5,000 | $7,000+ (complications) |
| Lithotripsy | $2,000 | $3,000–$4,500 | $6,000+ (multiple sessions) |
| Nephrectomy (kidney removal) | $3,000 | $4,000–$5,500 | $7,500+ |
| Annual preventive care (monitoring + prescription diet) | $400 | $600–$1,000 | $1,500+ |
| Emergency visit (after-hours, critical care) | $1,500 | $2,500–$5,000 | $8,000+ |
Pet insurance can significantly offset these costs. Most comprehensive policies (e.g., Trupanion, Healthy Paws, Nationwide) cover kidney stone diagnosis and treatment if the condition develops after the policy effective date and outside the waiting period. Typical reimbursement is 70-90% after deductible. However, if your dog has a history of urinary crystals or stones before enrollment, these may be classified as pre-existing conditions and excluded. Review your policy's terms carefully.
Frequently Asked Questions
Can dogs pass kidney stones on their own?
Small stones (under 2-3 mm) may pass through the ureter into the bladder and eventually be urinated out, but this process can be painful and carries a risk of the stone becoming lodged in the ureter or urethra, causing a dangerous obstruction. Never attempt to "wait it out" without veterinary guidance — your vet needs to assess stone size and location via imaging before determining if conservative management is safe.
Are kidney stones the same as bladder stones in dogs?
No. While both are types of uroliths, kidney stones (nephroliths) form in the kidney or renal pelvis, while bladder stones (cystoliths) form in the bladder. Bladder stones are far more common in dogs. However, kidney stones can migrate into the ureter (the tube connecting kidney to bladder) or even reach the bladder, where they may cause obstruction at any point along the urinary tract.
Can diet alone cause kidney stones in dogs?
Diet is a significant contributing factor but rarely the sole cause. Most kidney stones result from a combination of genetic predisposition, metabolic factors, hydration status, and dietary mineral content. That said, feeding a diet excessively high in certain minerals (calcium, oxalate, purines) without adequate water intake can create conditions favorable for stone formation, especially in predisposed breeds.
How quickly do kidney stones form in dogs?
Stone formation is a gradual process that typically takes weeks to months. Crystals can appear in urine within days under favorable conditions, but growing into clinically significant stones usually requires sustained supersaturation of minerals over time. This is why regular urinalysis monitoring in predisposed breeds can catch crystalluria (crystals in urine) before stones fully form.
Is kidney stone recurrence common in dogs?
Yes. Without a targeted prevention plan, recurrence rates for canine uroliths are estimated at 20-50% within three years. This is why stone analysis (identifying exact mineral composition) and follow-up monitoring are critical. Dogs on appropriate therapeutic diets with regular recheck urinalysis have significantly lower recurrence rates — in some studies, below 10% over three years.
Can supplements help prevent kidney stones in dogs?
Some supplements may help, but only under veterinary guidance. Potassium citrate is sometimes prescribed to alkalinize urine and bind calcium, reducing calcium oxalate risk. Omega-3 fatty acids (EPA/DHA) may reduce renal inflammation. However, certain supplements like vitamin C (ascorbic acid) can actually increase calcium oxalate stone risk because vitamin C metabolizes to oxalate. Never start supplements without discussing them with your veterinarian first.
Robin Maitland
All our authors care for dogs every day — read more of their work on the authors page.
