Preventing bladder stones in dogs comes down to three core strategies: keeping urine dilute, feeding the right diet for your dog’s stone type, and treating urinary infections promptly. Dogs that have formed stones once are likely to form them again, so prevention is an ongoing effort rather than a one-time fix. The specific approach depends on what type of stone your dog is prone to, because the dietary and pH targets differ significantly between types.
Keep Urine Dilute
The single most effective thing you can do for any stone type is increase your dog’s water intake. Dilute urine means minerals stay dissolved instead of clumping into crystals. The veterinary target is a urine specific gravity of 1.020 or lower, which your vet can check with a simple urinalysis. The more dilute the urine, the better the protection.
Practical ways to boost water intake include adding water or low-sodium broth to your dog’s food, switching from dry kibble to canned food (which is roughly 75% water), and placing multiple fresh water bowls around the house. Some dogs drink more from a pet water fountain. Frequent bathroom breaks also help, since urine sitting in the bladder for hours gives crystals more time to form.
Match the Diet to the Stone Type
This is where prevention gets specific. The two most common bladder stones in dogs, struvite and calcium oxalate, require opposite urine pH targets. Feeding a prevention diet designed for one type can actually increase risk for the other, so knowing which stone your dog forms is essential. If your dog has had stones removed or dissolved, your vet should have sent them to a lab for mineral analysis.
Struvite Stones
Struvite stones thrive in alkaline urine, so prevention diets aim for a urine pH between 6.0 and 6.5, which is slightly acidic. These diets are typically lower in magnesium and phosphorus, the building blocks of struvite crystals. Most struvite stones in dogs are directly linked to urinary tract infections, which makes treating and preventing infections just as important as the diet itself (more on that below).
Calcium Oxalate Stones
Calcium oxalate stones form in acidic urine, so the target pH is higher: 6.5 to 7.5. Unlike struvite stones, calcium oxalate stones cannot be dissolved with diet. They have to be physically removed. That makes prevention especially important for dogs that have already had them. Prevention diets for calcium oxalate avoid excess calcium and oxalate while providing adequate (not excessive) protein.
Potassium citrate is commonly prescribed alongside dietary changes for calcium oxalate prevention. Citrate works in two ways: it binds to calcium in the urine so less calcium is available to form stones, and it makes urine more alkaline. The University of Minnesota’s Urolith Center recommends a starting dose of 75 mg/kg twice daily, adjusted to reach a urine pH near 6.5. Your vet will monitor urine pH and adjust the dose over time.
Urate Stones
Dalmatians and English Bulldogs have a genetic defect in how they process purines, a compound found in many protein sources. This leads to urate stones, which require a different dietary strategy entirely. Organ meats contain the highest purine levels and should be avoided completely. The lowest-purine protein sources are dairy and eggs, so cottage cheese or egg-based diets are commonly used. Some Dalmatians do well on vegetarian diets. Reducing overall protein intake can also help, but this needs to be balanced carefully to avoid malnutrition. Dogs with urate stones often need medication in addition to diet changes.
Treat Urinary Infections Aggressively
Urinary tract infections are the primary driver of struvite stones in dogs. Certain bacteria produce an enzyme that makes urine more alkaline, creating the perfect environment for struvite crystals to form. In one study, nearly two-thirds of patients with struvite stones had a positive bacterial culture. Even when a standard urine culture comes back negative, infection can still be present, sometimes involving antibiotic-resistant bacteria.
If your dog is prone to struvite stones, any signs of a UTI (frequent urination, straining, blood in urine, accidents in the house) warrant a prompt vet visit. Completing the full course of antibiotics matters too, since partially treated infections can smolder and restart stone formation. Female dogs are more susceptible to UTIs and therefore to infection-related struvite stones.
Schedule Regular Monitoring
Prevention is not something you set up once and forget. Dogs with a history of stones need periodic urinalysis to check that urine pH and concentration are staying in the target range. Your vet will likely recommend checking urine every few months initially, then adjusting the schedule based on results. Periodic imaging, either X-rays or ultrasound, can catch new stones while they’re still tiny and easier to manage.
Monitoring is particularly important after any changes to your dog’s diet, supplements, or medications, since all of these shift urine chemistry. If your dog is on potassium citrate for calcium oxalate prevention, urine pH checks help your vet fine-tune the dose. For struvite-prone dogs, a routine urine culture can catch infections before they have time to seed new stones.
Breeds With Higher Risk
Some breeds are genetically predisposed to specific stone types, which means prevention should start before the first stone ever forms. Dalmatians and English Bulldogs are prone to urate stones due to their purine metabolism. Miniature Schnauzers, Bichon Frises, Shih Tzus, and Lhasa Apsos have elevated rates of calcium oxalate stones. Small-breed dogs in general tend to form stones more often than large breeds.
If you have a high-risk breed, ask your vet about baseline urinalysis even if your dog has never shown symptoms. Catching crystals in the urine before they become full stones gives you a much bigger window for dietary and hydration changes to work.
What a Prevention Plan Looks Like Day to Day
For most dog owners, stone prevention translates into a few concrete habits. Feed a veterinary-recommended diet matched to your dog’s stone type, and stick with it consistently. Add water to every meal. Keep fresh water available at all times and encourage drinking. Take your dog out frequently so urine doesn’t sit in the bladder for extended periods. Watch for any signs of urinary discomfort and act on them quickly. And keep your monitoring appointments, even when your dog seems perfectly fine, because stones can grow silently for months before causing symptoms.
The good news is that these strategies genuinely work. Dogs on appropriate prevention plans have significantly lower recurrence rates than dogs that return to a standard diet after stone removal. The key is consistency and knowing exactly which stone type you’re trying to prevent.