Nephrolithiasis (Kidney Stones) in Dogs


Overview of Nephrolithiasis (Kidney Stones) in Dogs

Nephrolithiasis is the condition marked by the presence of renal calculi or kidney stones.

One function of the urinary system is the removal of body wastes in liquid form. Some mineral wastes are only slightly soluble and may form crystals. If the transit time of crystal movement through the urinary system is prolonged, crystals may interact and grow into stones.

Causes of Kidney Stones in Dogs

Several types of stones can affect cats and dogs. Each type of stone is often associated with its own specific cause. General causes include:

  • Underlying urinary tract infections or infection within the kidney
  • Genetic defects
  • Dietary factors or supplements
  • Administration of certain medications
  • Concurrent or underlying conditions or illness

    Overall, kidney stones are slightly more common in the female dog and are generally seen in the middle-aged animal, although they can be seen in any age. There are different breed predilections for each type of calculi, and in the dog, although any breed can be affected, there is a predilection for the miniature schnauzer, miniature, poodle, Yorkshire terrier, Lhasa apso, shih tzu, bichon and cocker spaniel.

    Urine retention and the formation of concentrated urine may predispose to calculi.

  • What to Watch For

    Signs of kidney stones in dogs: 

  • Bloody urination
  • Abdominal pain
  • Recurrent urinary tract infections
  • Vomiting

    Clinical signs depend on the exact location, size, shape and number of kidney stones. Affected individuals may have no clinical signs. Other signs such as painful urination or frequent urination may be seen in patients who have a concurrent lower urinary tract infection. Some patients may be extremely ill if they have associated kidney failure or severe infection.

  • Diagnosis of Kidney Stones in Dogs

    Diagnostic tests for kidney stones may include: 

  • Complete blood count (CBC)
  • Biochemical profile
  • Urinalysis
  • Bacterial urine culture
  • Radiographs (X-rays)
  • Abdominal ultrasound or excretory urography
  • Treatment of Kidney Stones in Dogs

  • Depending on the dog, recommended treatment options may vary.
  • Inactive nephroliths may only require periodic monitoring.
  • If the stones are an incidental finding or the pet is not having severe clinical signs, medical and/or dietary dissolution may be attempted. It is important for both you and your veterinarian to monitor your pet very closely during this period, as it is possible that not all stones can or will dissolve.
  • If the dog is in kidney failure or is having severe clinical signs associated with the presence of the stones, their removal, either surgical or by lithotripsy, would be recommended.
  • Antibiotic therapy is indicated in those patients with concurrent urinary tract infections.
  • Fluid therapy is indicated in those patients who are dehydrated, have severe infections, or have concurrent kidney failure.
  • Home Care

    If your dog is on a stone dissolving diet, complete compliance is necessary. NO snacks or other diets are permitted, as these may negate the beneficial effects of the special diet. Administer all medication and return for follow-up as directed by your veterinarian.

    If your pet is being treated for nephrolithiasis and suddenly seems ill, contact your veterinarian at once.

    Preventative Care

    Eliminating urinary tract infections may help prevent nephrolithiasis. Treating and controlling underlying disorders may help prevent recurrence of stones.

    In-depth Information on Nephrolithiasis (Kidney Stones) in Dogs

    Nephrolithiasis is the condition characterized by the presence of nephroliths (also referred to as calculi or kidney stones) which are stones located within the kidney pelvis. Nephroliths have several potential causes, and a host of possible presentations are associated with their presence. Some factors may enhance the susceptibility to nephrolithiasis such as congenital abnormalities, metabolic disorders or disorders that promote urine retention, but no specific underlying disorder need exist.

    Individuals with kidney stones may be have no clinical signs, although some patients may be quite ill, as the presence of stones can cause pain and lead to kidney failure, sepsis (infection throughout the bloodstream) and even death. Depending on the specific case, specific diagnostics and therapeutics are tailored to the individual.

    Several diseases/disorders are similar to nephrolithiasis. These include:

  • Pyelonephritis, which is an infection of the kidney
  • Urolithiasis, which are stones anywhere throughout the urinary tract
  • Lower urinary tract infection
  • Chronic kidney failure may be associated with or the result of nephrolithiasis.
  • Other causes of abdominal pain such as pancreatitis or peritonitis (inflammation of the abdominal cavity) need to be considered, as some animals with nephrolithiasis will experience abdominal pain.
  • Disorders associated with back pain such as intervertebral disc protrusion or a spinal infection or tumor may need to be differentiated.
  • Disorders that cause increased thirst and urination including hyperadrenocorticism (Cushing’s disease), diabetes mellitus, kidney disease and liver disease
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