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Urachal Anomalies (Malformations of the Embryonic Connection between the Bladder and Umbilical Cord) in Dogs

Occurrence: very rare
Location of illness: Abdomen/pelvis

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

Urachal anomalies in dogs are congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. malformations that affect the embryonic connection between the bladder and the umbilical cord. These anomalies can cause the urachus, which normally disappears after birth, to remain partially or completely open, which can lead to various health problems.

The most important facts at a glance

Urachal anomalies in dogs occur when the embryonic duct connecting the bladder to the umbilical cord does not close properly after birth. Normally, this duct turns into a fibrous band, but genetic factors or developmental disorders can disrupt this process. Anomalies include persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. urachus and urachal cysts, which can be influenced by genetic predispositions or environmental factors during pregnancy.

Symptoms are often a massIn pathology, the term "mass" is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer). and Pain on palpationPalpation is an examination method in which the condition of body tissues is assessed by feeling them with the hands. It is used to identify swelling, pain, or other abnormalities. in the navel area, mucus formation, Urine dribbling, Inflammatory conditions, and difficulty urinating. 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 through clinical examinations and imaging procedures such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or X-rays to visualize the structure of the urachus. In some cases, urine or blood tests are performed to detect infections.

Treatment varies depending on the severity and may include surgery under general anesthesiaGeneral anesthesia is a medical procedure that induces unconsciousness and eliminates pain during surgical procedures. It involves the use of anesthetics to temporarily shut down the body's overall perception. to close the urachus or remove cysts. After surgery, antibiotic treatments to control infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. are often necessary. 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 treatment significantly improve 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., while untreated cases can lead to complications such as chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. infections.

Preventive measures are limited because the causes are often genetic. Breeders should pay attention to genetic predispositions and ensure good prenatal care of the bitch. Research focuses on genetic and environmental causes as well as on improving diagnostic methods and surgical techniques to make treatment more effective.

Causes

The urachus is an embryonic duct that connects the bladder of the developing fetusThe fetus is a developmental stage of a mammal in the womb that follows after it has passed through the embryonic phase. In humans, the term fetus is used from the 9th week of pregnancy until birth. to the umbilical cord. During normal development, the urachus should completely close after the dog’s birth and be converted into a band of fibrous tissue. If this process is disrupted, urachal anomalies can occur.

There are various forms of urachal anomalies, including the persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. urachus, where the duct remains open, and the urachal cyst, where fluid accumulates in a partially closed duct. These anomalies are usually caused by genetic factors or developmental disorders during pregnancy.

Genetic predispositions play a significant role in the development of urachal anomalies. Certain dog breeds may be more susceptible to these malformations due to their genetic makeup. Environmental factors affecting the mother during pregnancy could also influence the development of the urachus.

Symptoms

Very common symptoms:

Common symptoms:

Difficulty Urinating (Dysuria)

The symptoms of urachal anomalies in dogs can vary depending on the type and severity of the anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later.. A common symptom is urine leaking from the navel, which indicates that the urachus has remained open. This can lead to irritation of the skin around the navel area.

Dogs with urachal cysts may have a palpable massIn pathology, the term “mass” is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer). in the abdominalThe term “abdominal” refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. area, sometimes associated with pain. Infections are also common, as stagnant urine in the duct or cystA cyst is a closed sac that may contain fluid, air, or other material. Cysts can occur in any part of the body and vary in size and cause. is a breeding ground for bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease.. This can lead to Fever, lethargy, and decreased food intake.

Other symptoms may include frequent urination, difficulty urinating, or blood in the urine. These signs result from impaired urinary tract function or an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. facilitated by the urachal anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later..

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 urachal anomalies is usually made through a combination of clinical examinations and imaging procedures. The veterinarian will first take a complete 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. and perform a physical examination to identify obvious signs such as urine leaking from the navel.

To confirm 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., imaging techniques such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., X-rays, or contrast urographyUrography is an imaging procedure that shows the structure and function of the urinary tract. In dogs and cats, it is used to diagnose abnormalities or diseases of the kidneys, ureters, bladder, and urethra. can be used. These techniques help to visualize the exact structure of the urachus and the presence of cysts or other anomalies.

In some cases, a urine or blood testA blood test is a laboratory procedure in which blood is drawn and analyzed to obtain information about the body's health. It can include various parameters such as blood sugar, blood count, liver and kidney values. may be performed to identify signs of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. or other concomitant diseases. An accurate 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 crucial to determine the appropriate treatment.

Therapy

The treatment of urachal anomalies depends on the type and severity of the anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later.. In most cases, surgery is required to close the open urachus or remove cysts. This surgery is usually performed under general anesthesiaGeneral anesthesia is a medical procedure that induces unconsciousness and eliminates pain during surgical procedures. It involves the use of anesthetics to temporarily shut down the body's overall perception. and requires precise surgical techniques.

After surgery, antibiotic treatment may be necessary to prevent or treat infections. In the postoperativePostoperative refers to the time after a surgical operation. This phase includes recovery and the management of possible complications after the procedure. phase, it is important to monitor the dog and ensure that it recovers well and does not experience any complications.

In cases where surgery is not possible or necessary, conservative treatment may be considered. This may include administering antibiotics to control infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and regular monitoring.

Prognosis and follow-up care

The prognosis for dogs with urachal anomalies varies depending on the type of anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. and the treatment performed. 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 appropriate surgical treatment, 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. is usually good, and many dogs recover completely without long-term consequences.

However, if complications such as severe infections occur or the anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. is not treated in time, this can worsen 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.. Long-term problems such as chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. urinary tract infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. or scar tissue formation can occur in rare cases.

Careful monitoring and follow-up care are crucial to ensure that the dog does not develop any further health problems and recovers completely.

Prevention

Since the exact cause of urachal anomalies is often genetic, there are limited opportunities for preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. However, breeders should be careful not to mate animals that have known genetic predispositions to these anomalies.

Good prenatal care of the pregnant bitch can also help minimize the risk of developmental disorders in the fetusThe fetus is a developmental stage of a mammal in the womb that follows after it has passed through the embryonic phase. In humans, the term fetus is used from the 9th week of pregnancy until birth.. This includes a balanced diet, regular veterinary checkups, and avoiding environmental factors that could impair fetal development.

Regular checkups with the veterinarian can help detect and treat urachal anomalies early before they lead to serious health problems. Early intervention significantly improves the chances of successful treatment.

Outlook on current research

Current research on urachal anomalies in dogs focuses on the genetic and environmental causes of these malformations. Scientists are investigating which genetic markers are associated with a higher 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. to urachal anomalies in dogs. This is particularly important to improve breeding practices and minimize the risk of this disease in future generations. There is evidence that certain breeds may be more susceptible to urachal anomalies, which underscores the importance of genetic studies.

Another focus of research is the development of improved diagnostic methods. Currently, a combination of ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. and radiography is often used to identify urachal anomalies. However, researchers are working to refine these techniques to enable accurate and early diagnoses. Advances in imaging technology could help detect even subtle anomalies that may have been overlooked so far.

In addition, new surgical techniques are being developed to make the treatment of urachal anomalies more effective. The traditional surgical removal of the anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. can be supplemented by minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures that promise faster recovery and fewer complications. Studies are also investigating the possibility of using regenerative medicine to repair or replace damaged tissue.

Another significant area of research is the study of the role of nutrition and the prenatal environment in the development of urachal anomalies. It is suspected that certain deficiencies or toxins during pregnancy could increase the risk of these malformations. These studies could lead to preventive measures that reduce the occurrence of urachal anomalies.

In the long term, research aims to develop comprehensive preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies that take into account both genetic and environmental factors. Through the collaboration of various scientific disciplines, researchers hope to gain a deeper understanding of this complex disease and thus improve the well-being of dogs worldwide.

Frequently asked questions (FAQs)

What are Urachal Anomalies in Dogs? Urachal anomalies are malformations that result from problems in embryonic development, particularly the connection between the bladder and the umbilical cord. These anomalies can lead to various health problems, such as recurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. infections or urinary drainageDrainage refers to the removal of fluid from body cavities, Wounds, or inflamed areas, often using a tube or other device. It is used to prevent infection and promote healing. disorders.
How are Urachal Anomalies Recognized in Dogs? Urachal anomalies are usually recognized by clinical signs such as a constantly moist navel area, infections, or urinary problems. A definitive 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 by imaging techniques such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or X-rays.
Which Dogs are Most Often Affected by Urachal Anomalies? While all dogs can potentially be affected, there is evidence that certain breeds may have a higher 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.. However, research on this is not yet complete, and there are no firm findings on specific breed risks.
What Treatment Options are Available for Urachal Anomalies? Treatment depends on the severity of the anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later.. In many cases, surgery is necessary to correct the malformation. Minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. techniques and the application of regenerative medicine are the subject of current research and could play a role in the future.
Can Urachal Anomalies be Prevented? Currently, there are no reliable methods for preventing urachal anomalies, as the exact causes are not yet fully understood. However, a healthy diet and avoiding environmental factors that could be harmful during pregnancy are generally recommended measures.
Are Urachal Anomalies in Dogs Genetically Determined? It is believed that genetic factors play a role, but the exact genetic basis has not yet been fully explored. Future genetic studies could help develop more precise breeding practices to minimize the risk of this disease.
How Common are Urachal Anomalies in Dogs? Urachal anomalies are relatively rare, but accurate frequency rates are difficult to determine because mild cases may go undetected. However, veterinarians are increasingly sensitized to detect these anomalies early.
What Symptoms Can Indicate an Urachal AnomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later.? Symptoms may include constant Licking of the navel area, recurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. urinary tract infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., incontinenceIncontinence refers to the inability to voluntarily control urine or stool, leading to involuntary loss. There are various forms, including urinary incontinence and fecal incontinence, which can be caused by different factors., or unusual urine drainageDrainage refers to the removal of fluid from body cavities, Wounds, or inflamed areas, often using a tube or other device. It is used to prevent infection and promote healing.. If an urachal anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. is suspected, the dog should be examined by a veterinarian.
How is 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 Urachal Anomalies Made? 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. is usually made through a combination of clinical examinations and imaging procedures. UltrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. is a commonly used method because it provides a detailed view of the internal structures.
What Long-Term Effects Can Urachal Anomalies Have on a Dog’s Health? If left untreated, urachal anomalies can lead to chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. infections and other health problems. Timely 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 treatment are crucial to avoid possible complications and maintain the quality of life of the affected dog.