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Fanconi Syndrome (Kidney Dysfunction) in Dogs

Occurrence: rarer
Location of illness: Abdomen/pelvis

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in dogs is a rare but serious kidney disease in which the renal tubules do not function properly, leading to excessive loss of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells., amino acids, bicarbonate, and other substances in the urine.

The most important facts at a glance

Fanconi syndrome in dogs is a kidney dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life. in which the renal tubules cannot correctly absorb important substances from the urine back into the blood. This leads to a loss of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells., amino acids, bicarbonate, and phosphate in the urine. The causes can be genetic or acquired. Certain breeds such as the Basenji are genetically predisposed, while acquired cases can result from poisoning, medications, or infections. Symptoms include increased thirst, increased urination, loss of appetite, diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., and weight loss. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made via urine and blood tests to detect typical abnormalities, but the syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. differs from diabetes mellitus by a non-elevated blood sugar level. Treatment aims to relieve symptoms and support kidney function, as a cure is not possible. This includes infusions to correct dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse. and electrolyte imbalances, as well as specialized diets. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. varies depending on the cause and severity of kidney damage. Research focuses on genetic and environmental causes, as well as the development of new therapeutic approaches. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. includes avoiding toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances and regular veterinary examinations. Advances in research could benefit both affected dogs and similar human diseases.

Causes

The kidneys play a crucial role in filtering and reabsorbing important substances from the primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. urine. In a normal state, the renal tubules reabsorb these substances back into the blood to keep the body in balance. In Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment., this reabsorption is impaired.

The causes of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. can be genetic or acquired. In certain dog breeds such as the Basenji, Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. occurs more frequently, suggesting a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. This genetic form usually occurs in middle age and is often associated with a family historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits..

Acquired causes can be caused by poisoning, certain medications, or infections. For example, in the past, cases of acquired Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. have been linked to the consumption of jerky treats from China. These treats led to a toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. reaction in some dogs that damaged the kidneys.

Medications such as certain antibiotics or chemotherapeutic agents can also impair the function of the renal tubules and triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. Long-term or high-dose use of such medications should therefore always be under veterinary supervision.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. are often non-specific and develop insidiously, which can make diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. difficult. A common sign is excessive thirst (polydipsiaPolydipsia refers to an increased feeling of thirst and increased fluid intake. It can be a symptom of various diseases, including diabetes mellitus and kidney disease.) and increased urination (polyuriaPolyuria refers to a significantly increased urine output. It can be a symptom of various diseases, including diabetes mellitus, kidney disease, and hormonal disorders.) as the body tries to compensate for the loss of important substances.

Another symptom may be weight loss despite normal or increased food intake. This happens because the body does not receive enough energy and building blocks due to the loss of nutrients in the urine.

Affected dogs may also show signs of muscle weakness or loss of performance. This is often due to the loss of electrolytesElectrolytes are minerals in the body that carry an electric charge and perform vital functions such as regulating fluid balance, acid-base balance, and nerve and muscle activity. The main electrolytes include sodium, potassium, chloride, and magnesium. and amino acids, which are necessary for muscle and body function.

In advanced cases, signs of acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders. may occur, such as vomiting, loss of appetite, and apathyApathy refers to a state of indifference and reduced interest or lack of emotional involvement in activities or events that would normally arouse interest.. This is due to the loss of bicarbonate in the urine, which leads to an imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. in the body’s acid-base balanceThe acid-base balance refers to the equilibrium between acids and bases in the body, which is important for maintaining the physiological pH in the blood and other bodily fluids. Imbalances can lead to serious health problems..

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. is based on a combination of clinical symptoms and specific laboratory tests. An initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. step is the analysis of the urine to determine the presence of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. and other substances that should not normally be found in the urine.

Blood tests can also be performed to confirm the presence of electrolyte imbalances, acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders., and other abnormalities in the blood count. However, an elevated blood sugar level is not a typical feature of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment., which distinguishes it from diabetes mellitus.

Another diagnostic tool is fractional excretion (FE), which measures the amount of substances excreted in the urine relative to their concentration in the blood. This can help determine the extent of renal tubular dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life..

In some cases, a kidney biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. may be considered to rule out other kidney diseases, although it is rarely necessary.

Therapy

Treatment for Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. focuses on relieving symptoms and supporting kidney function, as the disease cannot be cured. One of the most important measures is the correction of dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse. and electrolyte imbalances through infusions and specialized diets.

A diet rich in essential amino acids and vitamins can help replace nutrients lost through the urine. In some cases, supplementationSupplementation is the addition of nutrients, vitamins, or other substances to a normal diet to compensate for deficiencies or to support general health and well-being. In dogs and cats, supplementation may vary depending on their health condition and nutritional needs. with sodiumSodium is a vital electrolyte that plays a key role in regulating water balance, blood pressure, and nerve and muscle activity. Unbalanced sodium levels can lead to various health problems in dogs and cats. bicarbonate may be necessary to correct metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders..

Medications that stabilize electrolytesElectrolytes are minerals in the body that carry an electric charge and perform vital functions such as regulating fluid balance, acid-base balance, and nerve and muscle activity. The main electrolytes include sodium, potassium, chloride, and magnesium. and support kidney function may also be prescribed. The exact medication depends on the severity of the symptoms and the individual needs of the dog.

If an underlying triggering factor is identified, such as a toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substance, it is important to stop contact with it immediately and, if possible, initiate specific treatment against the toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity..

Prognosis and follow-up care

The prognosis for dogs with Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. varies greatly and depends on several factors, including the extent of kidney damage and the speed with which the disease is diagnosed and treated. With early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and consistent treatment, many dogs can maintain a good quality of life.

In genetically determined Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment., especially in breeds such as the Basenji, the prognosis may be more cautious because the disease can progress. Regular veterinary monitoring and adjustments in treatment are necessary to slow the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.

Acquired forms of Fanconi syndrome caused by toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances or medications may have a better prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. if the triggering factor is quickly identified and removed.

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of Fanconi syndrome can be challenging, especially in genetic cases. In breeds with a known predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases., regular check-ups can help detect the disease early.

For acquired forms, it is important to avoid potentially harmful substances. This includes carefully selecting dog food and treats, especially products that come from sources that may not be well monitored.

Regular veterinary examinations and blood tests can help detect early signs of a kidney problem before a full Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. develops. This is especially important if a dog is taking medications that could affect kidney function.

Through a combination of genetic counseling, environmental control, and regular medical care, the risk of the occurrence or worsening of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in dogs can be reduced.

Outlook on current research

Research into Fanconi syndrome in dogs is a dynamic field that is constantly evolving. Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. is a rare but serious condition that is primarily observed in certain dog breeds such as Basenjis. It is a kidney dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life. in which the renal tubules are unable to correctly reabsorb certain substances in the blood, resulting in a significant loss of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells., amino acids, bicarbonate, and phosphate in the urine. Research focuses on better understanding the genetic and environmental causes of this disease.

One of the current research directions is investigating the genetic basis of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. Scientists have already identified some genetic markers that are associated with the disease, especially in Basenjis. These findings could help develop genetic tests in the future that allow breeders to minimize the risk of the disease in their breeding lines. Further studies are needed to decipher the complete genetic profile of the disease and identify potential target structures for gene therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. approaches.

Another important area of research is the investigation of environmental factors that can contribute to the development of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. Some studies suggest that certain toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances or medications can triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. the disease. For example, in some cases, certain types of dog food or plastic toys containing toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances have been reported to be associated with the occurrence of the syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. Research in this area aims to identify the specific environmental factors that could increase the risk of developing Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment..

The development of new therapeutic approaches is also a focus of research. Currently, there is no cure for Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment., and treatment focuses on relieving symptoms and preventing complications. Researchers are working on developing medications and supplements that can support kidney function and reduce the loss of vital nutrients in the urine. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. clinical trials with experimental therapies have shown promising results, but further studies are needed to fully assess their safety and efficacy.

In summary, research into Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in dogs aims to gain a deeper understanding of the genetic and environmental causes of the disease, develop new diagnostic tests, and explore advanced treatment strategies. Advances in these areas could not only improve the lives of affected dogs but also provide valuable insights for the study of similar human diseases.

Frequently asked questions (FAQs)

What is Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in dogs? Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. is a rare kidney disease in which the renal tubules are unable to correctly reabsorb certain substances such as glucose, amino acids, bicarbonate, and phosphate from the blood, leading to an excessive loss of these substances in the urine.
Which dog breeds are most commonly affected? Fanconi syndrome has been frequently observed in Basenjis, but can also occur in other breeds such as Shetland Sheepdogs, Labrador Retrievers, and Norwegian Elkhounds. A genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. appears to play a role.
What are the symptoms of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in dogs? Symptoms include increased thirst and urination, weight loss, lethargy, poor coat quality, and in severe cases muscle weakness or convulsions due to an electrolyte imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems..
How is Fanconi syndrome diagnosed? DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through urine and blood tests that show abnormal amounts of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells., amino acids, bicarbonate, and phosphate in the urine and blood. A genetic test can be performed in Basenjis to confirm a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases..
Is there a cure for Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.? Currently, there is no cure for Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. Treatment focuses on managing the symptoms and preventing complications by administering supplements and special diets that compensate for the loss of nutrients.
How is Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. treated? Treatment usually involves administering oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. supplements to compensate for the loss of bicarbonate, potassiumPotassium is an essential mineral and electrolyte that is important for the function of nerves and muscles, including the heart muscle. Potassium also helps regulate fluid balance and blood pressure., and other important electrolytesElectrolytes are minerals in the body that carry an electric charge and perform vital functions such as regulating fluid balance, acid-base balance, and nerve and muscle activity. The main electrolytes include sodium, potassium, chloride, and magnesium.. A special diet may also be required to support kidney function and improve electrolyte balanceThe electrolyte balance refers to the balance of electrolytes in the body, which is essential for many physiological processes. Disturbances in the electrolyte balance can lead to serious health problems..
Can environmental factors triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.? There is evidence that certain environmental factors, such as toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances in dog food or toys, can increase the risk of developing Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. However, research in this area is not yet complete.
How can I minimize the risk of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in my dog? To minimize the risk, you should ensure that your dog receives a balanced diet and does not come into contact with potentially toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances. In breeds with a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases., a genetic test can be helpful to assess the risk.
Can Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. shorten my dog’s life? Without appropriate treatment, Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. can lead to serious complications that can significantly impair the dog’s quality of life and life expectancy. However, with proper care and treatment, many dogs can live a relatively normal life.
Are there ongoing research projects on Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.? Yes, there are numerous research projects that are investigating the genetic and environmental causes of Fanconi syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. These studies aim to develop new diagnostic and therapeutic approaches to improve the quality of life of affected dogs.