Urolithiasis is the condition where urinary calculi are formed in the urinary tract. It is a condition involving the formation of stones that may lodge into and block a dog's ureter, the muscular tube that connects the kidney to the bladder and carries urine from kidneys to the bladder. Typically, the stones originate in the kidneys and pass down into the ureter.
Small stones may pass down to bladder without any resistance but some larger stones may partially or completely obstruct the ureter, thus dilating upper ureter and subsequently kidney damage.
Commom symptoms of this condition are
Enlargement or shrinkage of the kidney
Accumulation of waste products like urea
Rupture of ureter, resulting in urine accumulation in the abdomen