Kidney Stones in Welsh Springer Spaniels: What Owners Should Watch For

Urine normally carries dissolved minerals like calcium, phosphorus, and various salts without incident. Stones form when the concentration of these minerals rises too high relative to the amount of water in the urine, or when urine pH shifts in a way that makes certain minerals less soluble, allowing them to crystallize and clump together over time.

Several common stone types exist, and they form under different conditions: struvite stones often form alongside urinary tract infections, since certain bacteria change urine chemistry in a way that favors crystal formation, while calcium oxalate stones tend to form in more acidic, concentrated urine independent of infection. A dog that drinks less water, has infrequent bathroom breaks, or eats a diet that consistently pushes urine toward one extreme or another has more opportunity for minerals to concentrate and crystallize.

A stone sitting quietly in the kidney itself often causes few symptoms until it grows large enough to cause discomfort or moves into the ureter or bladder. The real danger comes if a stone, or fragments of one, lodge somewhere narrow enough to block urine flow entirely, which turns a slow-forming problem into a sudden emergency.

Because stone formation is largely about hydration and urine chemistry over time, most of the useful prevention is about consistent daily habits rather than a single fix.