Bladder & Urinary Stones in Dogs: What They Are and How They're Treated

Bladder stones form when naturally occurring minerals in a dog's urine clump together into a solid, mineralized mass. Veterinarians technically refer to this condition as a urolith. While some dogs carry these stones without showing any discomfort, they can lead to severe pain and dangerous blockages if left unmanaged.

Understanding the various types of bladder stones in dogs is crucial, as their composition completely changes how veterinarians approach treatment and long-term prevention.

Are Bladder Stones in Dogs an Emergency?

In many cases, bladder stones start as a chronic, uncomfortable medical condition rather than an immediate crisis. However, they can instantly escalate into a life-threatening medical emergency if a stone travels into the urethra and causes a complete urinary obstruction.

A urinary blockage stops a dog from being able to empty their bladder entirely. This leads to toxins building up rapidly in the bloodstream, immense pain, and a high risk of bladder rupture.

Emergency Warning: If your dog is straining to urinate but producing no urine at all, is actively vomiting, or appears exceptionally weak, seek emergency veterinary care immediately.

How Do I Know if My Dog Has Bladder Stones?

The most common symptoms of bladder stones in a dog mimic general lower urinary tract diseases. Keep a close eye out for these clinical signs:

• Straining to urinate

• Bloody or discolored urine

• Pungent urine

• Needing to urinate more often than usual

• Having accidents in the house

• Excessive licking around the genital area

• A drop in energy levels, or loss of appetite

• Vomiting

What Causes Bladder Stones in Dogs?

When analyzing bladder stones in dogs causes, the primary mechanism is the saturation of minerals within the urinary system. When the urine contains too high a concentration of certain minerals, they precipitate out as crystals, eventually sticking together to form hard stones.

The two most common variations develop under distinct physiological conditions:

1. Struvite Stones

Struvite is a hard mineral deposit formed when magnesium and phosphate bind together. While isolated struvite crystals are relatively common in healthy canine urine, they turn into stones primarily due to lower urinary tract infections (UTIs). Ammonium-producing bacteria from an infection raise the urine pH, creating an alkaline environment where these crystals clump together rapidly.

• Risk Factors: According to clinical data from the Veterinary Information Network, 85% of dogs diagnosed with struvite stones are female, and the average age of an affected patient is 2.9 years old.

• Breed Predispositions: Shih Tzus, Miniature Schnauzers, Yorkshire Terriers, Labrador Retrievers, and Dachshunds appear to be at a significantly increased risk of forming struvite stones.

2. Calcium Oxalate Stones

Unlike struvite formations, the pH level of the urine has very little impact on calcium oxalate development. Instead, these stones form when the urine becomes oversaturated with calcium and oxalate. They generally develop in sterile urine and are completely unrelated to lower urinary tract infections.

• Risk Factors: In a stark contrast highlighted by a study published in The Canadian Veterinary Journal, calcium oxalate stones are much more common in male dogs than female dogs, and typically target an older population. The study noted that the average dog diagnosed with calcium oxalate stones was 9.3 years old.

• Breed & Genetic Risks:  Keeshonds, Norwich Terriers, Norfolk Terriers, and Pomeranians as breeds at an increased risk. Furthermore, molecular research conducted by the University of Minnesota successfully identified a specific genetic defect that predisposes dogs to calcium oxalate. A commercial genetic test is now available for English Bulldogs, and researchers have identified the exact same mutation in American Staffordshire Terriers, Border Collies, Boston Terriers, Bullmastiffs, Havaneses, Rottweilers, and Staffordshire Bull Terriers.

How Veterinarians Diagnose Bladder Stones

Because conditions like urinary tract infections or bladder tumors share identical clinical signs, veterinary diagnostics are required to confirm a case.

Veterinarians typically rely on a combination of the following tests to map out a clear picture:

• Imaging: X-rays or abdominal ultrasounds allow the vet to physically see the stones, determine their size, and check how many are present inside the bladder.

• Urinalysis: Testing a urine sample helps identify active crystal shedding, check the urine pH, and detect blood or structural cells.

• Urine Culture: This specific test screens for the presence of ammonium-producing bacteria to confirm or rule out an underlying UTI.

Treatment Options for Bladder Stones in Dogs

When deciding how do you treat bladder stones in dogs, a veterinarian’s approach depends entirely on the composition of the stone and whether the dog faces an immediate risk of a blockage.

1. Nutritional Dissolution

For dogs diagnosed with struvite stones, the standard medical consensus points toward non-invasive means. According to consensus guidelines from the American College of Veterinary Internal Medicine (ACVIM), veterinarians will likely suggest nutritional dissolution as the primary course of action.

This involves feeding a highly specialized, therapeutic food formulated to manipulate urine chemistry and safely dissolve the stones back into liquid. If the stone is associated with an active urinary tract infection, a course of antibiotics will be prescribed concurrently.

Several veterinary therapeutic diets are available to support this process. For example, Hill’s Prescription Diet offers complete and balanced formulas specifically designed to reduce the risk of both struvite and calcium oxalate crystal formation. These diets work by controlling mineral content in the urine while still providing high-quality nutrition. Options are available in both canned and dry forms to suit different preferences and needs.