Acute Kidney Injury in Dogs (Acute renal failure, AKI)
- Synonyms: Acute kidney injury, Acute renal failure, Acute renal dysfunction
- 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
Acute kidney injury in dogs is a sudden dysfunction of the kidneys, where they are no longer able to effectively filter and excrete waste products from the blood.
Das Wichtigste auf einen Blick
Acute renal failure is a serious condition in dogs, caused by various prerenal, renal, or postrenal causes. It requires rapid, intensive treatment to prevent irreversible kidney damage. diagnosis is made based on clinical, laboratory, and imaging parameters. With appropriate therapy, kidney function can fully recover with early interventional action.
Ursachen
The kidneys are vital organs that play a central role in maintaining the body’s fluid and electrolyte balance. They filter waste products and excess fluid from the blood, which are then excreted as urine. In acute renal failure, this ability is suddenly impaired or comes to a complete halt, leading to an accumulation of toxins in the body.
The causes of acute renal failure can be divided into prerenal, renal, and postrenal categories. Prerenal causes affect the blood supply to the kidneys and include conditions such as dehydration, shock, or heart failure, which can reduce blood flow to the kidneys. Renal causes are direct damage to the kidneys themselves, which can be caused by infection, toxic substances, or Inflammatory conditions. Postrenal causes occur when urine flow is blocked by obstructions such as stones or Tumors.
A common reason for acute renal failure is the ingestion of toxic substances. These include certain medications such as NSAID (non-steroidal anti-inflammatory drug)s, as well as poisonous plants such as lilies. Consuming foods like grapes or raisins can also lead to acute kidney damage in dogs. infectious causes such as leptospirosis can also lead to acute kidney damage.
A further contributing factor can be an underlying disease that makes the dog more susceptible to acute renal failure. These include chronic kidney diseases, which gradually worsen kidney function over time and impair the kidneys’ ability to respond to acute stress.
Symptoms
The Symptoms of acute renal failure can appear suddenly and are often severe. The most common signs include loss of appetite, Vomiting, and lethargy. These Symptoms are the result of the accumulation of toxins in the body, which can no longer be excreted due to insufficient kidney function.
Another typical symptom is increased or decreased urination. Some dogs show polyuria, meaning increased urine output, while others suffer from oliguria or anuria, which means severely reduced or absent urine production. dehydration can also occur as the body loses fluid that is no longer effectively regulated.
In advanced stages of the disease, neurological Symptoms such as tremors, Convulsions, or disorientation can occur. These arise from the toxic effects of waste products accumulating in the blood. Continued deterioration can lead to coma, which constitutes a medical emergency.
Another important symptom is bad breath, caused by the increased concentration of urea in the blood. These toxins enter the saliva and lead to a characteristic, unpleasant ammonia odor.
In summary: The combination of acute Vomiting + dehydration + changes in urine volume is highly suspicious.
Diagnose
The diagnosis of acute renal failure is based on a combination of clinical symptoms, blood tests, and urine analyses. Blood tests usually show elevated levels of blood urea nitrogen (BUN) and creatinine, indicating insufficient kidney function.
Additionally, a urine analysis can be performed to specifically examine the urine. Low urine specific gravity can indicate reduced concentrating ability of the kidneys. The presence of protein, blood, or casts in the urine can also indicate kidney damage.
Imaging techniques such as ultrasound or X-rays can be used to identify structural abnormalities or blockages in the urinary tract. These methods help to rule out postrenal causes such as urinary stones or tumors.
In some cases, a kidney biopsy may be necessary to more accurately determine the type and extent of kidney damage. However, this more invasive method is usually only used when the diagnosis remains unclear or specific treatment is being considered.
Therapie
The therapy for acute renal failure in dogs aims to support kidney function and address the underlying cause. Immediate medical attention is crucial to save the dog’s life.
Fluid therapy is one of the most important treatment measures. It helps to compensate for dehydration, improve blood flow to the kidneys, and promote the excretion of toxins. Fluid administration can be given intravenously to achieve a rapid effect.
Medications can also be used to relieve Symptoms and prevent complications. diuretics can be used to increase urine production, while medications to control Nausea and Vomiting can also be administered.
If acute renal failure is caused by an infection such as leptospirosis, antibiotics are required to treat the pathogens. In cases where toxins are the cause, specific treatment to neutralize or remove the toxins may be necessary.
In severe cases, dialysis may be required to temporarily take over kidney function and rid the body of accumulated waste products. However, this method is only offered in specialized clinics and is associated with high costs.
Prognose und Nachsorge
The prognosis for acute renal failure depends on several factors, including the cause, the severity of the disease, and the speed of treatment. Early diagnosis and treatment significantly improve survival chances.
For prerenal causes that are treated quickly, the prognosis is often good, as kidney function can recover once blood flow is restored. Renal damage, particularly that caused by toxic substances or severe infections, can, however, have lasting consequences.
If acute renal failure is not treated in time, it can lead to chronic kidney disease, which requires lifelong treatment. In severe cases, the disease can be fatal despite intensive treatment.
Prävention
prevention of acute renal failure in dogs includes several measures aimed at minimizing risk factors. One of the most important measures is avoiding exposure to known toxins, including certain medications, plants, and foods. Dog owners should inform themselves about potentially dangerous substances and store them safely.
Regular veterinary examinations can help to detect and treat underlying health problems early. A balanced diet and adequate fluid intake are also crucial to support kidney function and reduce the risk of dehydration and kidney stress.
For dogs at increased risk of kidney disease, special diets and dietary supplements may be recommended to promote kidney health. Dog owners should also ensure that their pets maintain a healthy lifestyle, including regular exercise, to avoid Overweight and associated health problems.
Another important preventive measure is vaccination against infections that can cause kidney damage, such as leptospirosis. In regions where these Diseases are common, vaccination can significantly reduce the risk of infection.
Ausblick auf aktuelle Forschung
Acute renal failure in dogs is an area of intensive veterinary research, as it often occurs suddenly and requires rapid treatment. New findings focus on early diagnosis and better treatment strategies to increase the survival chances of affected animals. An important research area investigates the possibilities of early diagnosis using biomarkers. These substances in the blood or urine could provide signs of kidney damage before clinical Symptoms appear, enabling faster interventional action.
Another promising research area is regenerative medicine, particularly the use of stem cells to repair damaged kidney tissue. Studies in animals have shown that stem cells have the potential to promote the regeneration of kidney cells and reduce Inflammatory conditions. However, this technology is still in the experimental phase and requires further investigation before it can be used in clinical practice.
The development of new medications to support kidney function is also an active research area. This investigates how certain medications can slow or stop the progression of kidney damage. Some of these medications aim to improve blood flow to the kidneys, while others are intended to reduce the inflammatory response that often occurs with acute renal failure.
Another important research field is the improvement of dialysis procedures in dogs. While dialysis is an established emergency treatment in humans, it is used less frequently in dogs. Advances in technology could make dialysis more accessible and effective for dogs, thereby significantly improving survival chances in acute renal failure.
Additionally, research is being conducted on optimizing nutritional strategies for dogs with kidney problems. Special diets that regulate the content of proteins, phosphates, and other minerals could help to relieve the kidneys and slow the progression of the disease. Future studies could help to more precisely determine the ideal diet for dogs with acute kidney problems.
Research on acute renal failure in dogs is complemented by the development of new diagnostic devices. Portable ultrasound devices and advanced imaging technologies could help veterinarians detect kidney damage more quickly and accurately. This would enable treatment plans to be adjusted rapidly and the effectiveness of therapy to be monitored.
Finally, genetic research is an emerging field investigating whether there are genetic predispositions for acute renal failure in certain dog breeds. This approach could, in the long term, help to develop breeding programs that reduce the risk of this disease.
Overall, current research shows promising approaches to improving the diagnosis and treatment of acute renal failure in dogs. The combination of new diagnostics, innovative treatment strategies, and preventive measures could significantly improve the prognosis for affected dogs in the future.
Frequently Asked Questions (FAQs)
1. What is acute renal failure in dogs?
2. What Symptoms occur with acute renal failure?
3. How is acute renal failure diagnosed?
4. What are the most common causes of acute renal failure in dogs?
5. How is acute renal failure treated?
6. Can a dog recover from acute renal failure?
7. How can acute renal failure in dogs be prevented?
8. Which dog breeds are more susceptible to acute renal failure?
9. What role does diet play in the treatment of acute renal failure?
10. Is long-term follow-up care necessary after acute renal failure?
Literatur
- Segev, G., Cortellini, S., Foster, J. D., Francey, T., Langston, C., Londoño, L., Schweighauser, A., & Jepson, R. E. (2024). International Renal Interest Society best practice consensus guidelines for the diagnosis and management of acute kidney injury in cats and dogs. The Veterinary Journal, 305, Article 106068. https://doi.org/10.1016/j.tvjl.2024.106068
- International Renal Interest Society. (2025). IRIS grading of acute kidney injury (AKI). International Renal Interest Society. https://www.iris-kidney.com/guidelines/grading.html
- Segev, G., Foster, J. D., Francey, T., Langston, C. E., Schweighauser, A., & Cowgill, L. D. (2024). International Renal Interest Society best practice consensus guidelines for intermittent hemodialysis in dogs and cats. The Veterinary Journal, 305, Article 106092. https://doi.org/10.1016/j.tvjl.2024.106092
- Rimer, D., Chen, H., Bar-Nathan, M., & Segev, G. (2022). Acute kidney injury in dogs: Etiology, clinical and clinicopathologic findings, prognostic markers, and outcome. Journal of Veterinary Internal Medicine, 36(2), 609–618. https://doi.org/10.1111/jvim.16375
- Dunaevich, A., Chen, H., Musseri, D., Kuzi, S., Mazaki-Tovi, M., Aroch, I., & Segev, G. (2020). Acute on chronic kidney disease in dogs: Etiology, clinical and clinicopathologic findings, prognostic markers, and survival. Journal of Veterinary Internal Medicine, 34(6), 2507–2515. https://doi.org/10.1111/jvim.15931
- Kopecny, L., Palm, C. A., Segev, G., & Cowgill, L. D. (2023). Ultrafiltration during intermittent hemodialysis in dogs with acute kidney injury. Journal of Veterinary Internal Medicine, 37(3), 1021–1029. https://doi.org/10.1111/jvim.16649
- Biscop, A., Castelain, D., Stock, E., et al. (2024). Assessment of cell cycle arrest biomarkers and neutrophil gelatinase-associated lipocalin to distinguish acute kidney injury from other diseases in dogs. Journal of Veterinary Internal Medicine, 38(5), 2523–2534. https://doi.org/10.1111/jvim.17143
- Dorn, E., Biscop, A., Devriendt, N., & Paepe, D. (2025). Outcome in critically ill dogs and dogs with acute kidney injury based on neutrophil gelatinase-associated lipocalin and tissue inhibitor of metalloproteinase-2. Journal of Veterinary Internal Medicine, 39(2), Article e70024. https://doi.org/10.1111/jvim.70024
- Muñoz-Blanco, L., & Salazar, V. (2025). Incidence of postoperative acute kidney injury in dogs without pre-existing renal disease. Frontiers in Veterinary Science, 12, Article 1483101. https://doi.org/10.3389/fvets.2025.1483101
- Thoen, M. E., & Kerl, M. E. (2011). Characterization of acute kidney injury in hospitalized dogs and evaluation of a veterinary acute kidney injury staging system. Journal of Veterinary Emergency and Critical Care, 21(6), 648–657. https://doi.org/10.1111/j.1476-4431.2011.00689.x