Urinary Stone Disease in Dogs (Urolithiasis)
- Occurrence: common
- Location of disease: Abdomen/pelvis
When to visit the vet?
Urgent see a veterinarian within 24 hours
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Urolithiasis in dogs refers to the formation of solid mineral deposits, known as stones, in various parts of the urinary tract, including the kidney, ureter, bladder, or urethra.
The most important facts at a glance
Urolithiasis in dogs occurs when mineral substances in the urine crystallize and form solid particles that can be found in the kidneys, ureters, bladder, or urethra. This crystallization is influenced by factors such as the urine pH value, the concentration of dissolved substances, and the urine flow rate. An unbalanced diet, genetic factors, and insufficient water intake are common causes. Symptoms include increased Urinary urgency, Pain during urination, and blood in the urine. The diagnosis is made through clinical examination, urinalysis, and imaging techniques such as X-ray or ultrasound. The therapy depends on the size and location of the stones and may include dietary changes, increased fluid intake, or surgical intervention. After stone removal, a special diet can help prevent recurrence. Prevention focuses on dietary adjustments and adequate fluid intake, supplemented by regular veterinary check-ups. Research investigates genetic, nutritional, and diagnostic approaches to understand and prevent the formation of urinary stones. New diagnostic and therapeutic methods are being developed to make detection and therapy less invasive. Advances in research offer promising approaches for the Prevention and therapy of this disease.
Causes
Urolithiasis occurs when mineral substances in the urine crystallize and grow together into solid particles. This crystallization is influenced by factors such as the urine pH value, the concentration of dissolved substances, and the urine flow rate. A dog’s urine is a complex mixture of water, minerals, waste products, and other substances that normally remain in solution. An imbalance of these components can promote crystallization.
The main causes for the formation of urinary stones are diverse. One of the most common causes is an unbalanced diet, which leads to a high content of certain minerals, such as calcium, magnesium, and phosphate. These minerals can accumulate in the bladder and other parts of the urinary tract. Genetic factors also play a role, with certain dog breeds being more susceptible to developing Urolithiasis, such as Dalmatians and Miniature Schnauzers.
Additionally, insufficient water intake can increase the risk, as concentrated urine promotes the formation of crystals. Urinary tract infections, especially bacterial infections, can also promote crystal formation by altering the urine pH value and encouraging mineral deposits. Endocrine diseases such as hyperparathyroidism or Cushing’s syndrome can also increase the risk of Urolithiasis.
Symptoms
The symptoms of Urolithiasis in dogs vary depending on the location and size of the stones. One of the most common symptoms is dysuria, which means difficulty or pain when urinating. Dogs may pass frequent but only small amounts of urine. Sometimes Hematuria may be visible.
Other signs may include lethargy, loss of appetite, and general restlessness. Dogs may lick or bite their genital area excessively to relieve discomfort. If the stones block the flow of urine, this can lead to a serious medical emergency, manifested by inability to produce urine and extreme pain.
Therapy
The therapy for Urolithiasis in dogs depends on the size, location, and type of stones. Small stones that do not cause significant symptoms can sometimes be dissolved with a special diet or flushed out by increased fluid intake. Dietary management strategies aim to change the urine pH value and reduce the concentration of the minerals involved.
In cases where the stones are too large or cause a blockage, surgical intervention may be necessary. Cystotomy is a common surgical technique in which the bladder is opened to remove stones. Alternatively, a non-invasive technique such as lithotripsy, which uses shock waves to break up the stones, can be used.
After the stones are removed, the dog is often put on a special diet to minimize the risk of recurrence. At the same time, medications may be prescribed to relieve Pain and treat infections, if present.
Prognosis and follow-up care
The prognosis for dogs with Urolithiasis varies depending on the severity of the condition and the timing of the therapy. With early detection and appropriate therapy, the prognosis is generally favorable, and many dogs recover completely. The removal of stones and dietary adjustments can significantly reduce the risk of recurrence.
Dogs suffering from recurrent urinary stones or underlying health problems that promote stone formation may require careful long-term monitoring. In such cases, regular veterinary care and possibly lifelong dietary adjustment are necessary to minimize the risk of complications.
Prevention
The Prevention of Urolithiasis in dogs primarily focuses on dietary adjustments and adequate fluid intake. A balanced diet tailored to the specific needs of the dog can help reduce the risk of urinary stone formation. Special prescription diets are available that aim to alter the urine pH value and increase the solubility of potential stone-forming substances.
Regular veterinary check-ups and urinalysis can help detect early signs of Urolithiasis and take timely action. It is also important to promote the dog’s water consumption by providing fresh water at all times and, if necessary, increasing water intake through wet food or adding water to dry food.
For dogs with a genetic predisposition to urinary stone formation, close monitoring and special Prevention strategies may be necessary to minimize the risk of recurrence. Close collaboration with the veterinarian is crucial to create an individual Prevention plan.
Outlook on current research
Current research on Urolithiasis in dogs focuses on the genetic, nutritional, and environmental factors that lead to the formation of urinary stones. Scientists are striving to identify the specific genetic markers that make some dog breeds more susceptible to this condition. It is known that certain breeds such as Dalmatians and Miniature Schnauzers have an increased predisposition for urinary stones, suggesting genetic factors. Research has made progress in identifying genes that influence the excretion of certain minerals, which could lead to better monitoring of at-risk animals.
Another research focus lies in investigating dietary habits and their role in the prevention of Urolithiasis. Diets specifically designed to prevent stone formation are being developed and tested. These diets are often low in protein and promote an optimal urine pH value to prevent the formation of crystals. Researchers are also investigating the effect of dietary supplements containing magnesium, calcium, and phosphorus to achieve a balance in urinary metabolism.
Furthermore, there are ongoing studies on the development of new diagnostic tools for the early detection of Urolithiasis. Improving imaging procedures such as ultrasound and X-ray, as well as developing non-invasive tests to analyze urine for the presence of crystal-forming substances, are of great interest. Such advances could facilitate diagnosis and enable early intervention to slow down or prevent disease progression.
In therapy, research focuses on the development of less invasive treatment methods. Extracorporeal shock wave lithotripsy, a technique in which sound waves are used to shatter stones, is increasingly being studied. This method could represent an alternative to surgical interventions, especially in dogs that are too weak for surgery. In the long term, research is also being conducted into the development of medications that alter the chemical composition of the urine to prevent stone excretion.
In summary, research on Urolithiasis in dogs is a multifactorial field encompassing genetic studies, nutritional science, imaging procedures, and therapeutic innovations. Advances in these areas offer promising approaches for the prevention and treatment of this painful and potentially dangerous condition.
Frequently Asked Questions (FAQs)
1. What is Urolithiasis in dogs?
2. What symptoms occur in dogs with Urolithiasis?
3. What are the causes of Urolithiasis in dogs?
4. How is Urolithiasis diagnosed in dogs?
5. What treatment options are available for dogs with Urolithiasis?
6. Can uroliths in dogs disappear on their own?
7. How can Urolithiasis be prevented in dogs?
8. Are certain dog breeds more susceptible to Urolithiasis?
9. Can a special diet help treat or prevent Urolithiasis?
10. How important is fluid intake in the prevention of Urolithiasis?
Literature
- Lulich, J. P., Berent, A. C., Adams, L. G., Westropp, J. L., Bartges, J. W., & Osborne, C. A. (2016). ACVIM Small Animal Consensus Recommendations on the treatment and prevention of uroliths in dogs and cats. Journal of Veterinary Internal Medicine, 30(5), 1564–1574. https://doi.org/10.1111/jvim.14559
- Kopecny, L., Palm, C. A., Segev, G., & Westropp, J. L. (2021). Urolithiasis in dogs: Evaluation of trends in urolith composition and risk factors (2006–2018). Journal of Veterinary Internal Medicine, 35(3), 1406–1415. https://doi.org/10.1111/jvim.16114
- Manoharan, S. A., Berent, A. C., Weisse, C. W., Purdon, K., & Bagley, D. (2024). Medical dissolution of presumptive upper urinary tract struvite uroliths in 6 dogs (2012–2018). Journal of Veterinary Internal Medicine, 38(6), 3095–3104. https://doi.org/10.1111/jvim.17204
- Naeverdal, T. V., Midtgård, J. E., Llarena, A. K., & Ziener, M. L. (2023). A retrospective study on epidemiology and management of canine cystine uroliths in one part of Norway from 2015 to 2020. Acta Veterinaria Scandinavica, 65, 47. https://doi.org/10.1186/s13028-023-00711-z
- Hesse, A., Hoffmann, J., Orzekowsky, H., & Neiger, R. (2016). Canine cystine urolithiasis: A review of 1760 submissions over 35 years (1979–2013). The Canadian Veterinary Journal, 57(3), 277–281.
- Saver, A., Lulich, J. P., Van Buren, S., & Furrow, E. (2021). Calcium oxalate urolithiasis in juvenile dogs. Veterinary Record, 189(3), e141. https://doi.org/10.1002/vetr.141
- Hoelmer, A. M., Lulich, J. P., Rendahl, A. K., & Furrow, E. (2022). Prevalence and predictors of radiographically apparent upper urinary tract urolithiasis in eight dog breeds predisposed to calcium oxalate urolithiasis and mixed breed dogs. Veterinary Sciences, 9(6), 283. https://doi.org/10.3390/vetsci9060283
- Trehy, M. (2022). Nutritional management of urolithiasis in dogs and cats. In Practice, 44(9), 516–528. https://doi.org/10.1002/inpr.91