von Willebrand factor helps blood platelets stick to damaged blood vessels and to each other, forming a clot that stops bleeding after injury. When the level of this protein is lower than normal, affected dogs may experience prolonged or excessive bleeding.
vWD1 is the most common form of von Willebrand Disease found in dogs and is generally considered milder than other forms, such as Type 2 or Type 3. However, the severity of symptoms can vary widely between individual dogs and breeds. Some dogs may never show obvious clinical signs, while others may develop significant bleeding problems during surgery, injury, or trauma. Because symptoms may remain unnoticed for years, genetic testing is an important tool for early identification and responsible breeding decisions.
Common signs of von Willebrand Disease Type 1 include prolonged bleeding from cuts or wounds, nosebleeds, bleeding gums, excessive bruising, blood in the urine or stool, and prolonged bleeding after surgeries, vaccinations, nail trimming, or tooth loss. Female dogs may also experience heavier bleeding during heat cycles or after giving birth. In more serious cases, uncontrolled bleeding can become life-threatening if not treated promptly.
vWD1 is inherited in a genetic pattern that may vary slightly between breeds, but it is commonly associated with autosomal inheritance involving incomplete dominance or variable expression. Dogs may be genetically clear, carriers, or affected depending on the number of mutated gene copies inherited from their parents. Carrier dogs may have lower-than-normal levels of von Willebrand factor without showing obvious symptoms, while affected dogs generally have a greater risk of bleeding complications.
The von Willebrand Disease Type 1 genetic test identifies whether a dog carries the mutation associated with the disorder. Testing is simple and non-invasive, usually performed using a cheek swab or blood sample. The DNA sample is analyzed in a laboratory to determine whether the mutation is absent, present in one copy, or present in two copies. Genetic testing provides accurate results even before symptoms appear, allowing breeders and owners to make informed decisions regarding breeding and health management.
Responsible breeding practices are essential for reducing the frequency of vWD1 within susceptible breeds. Since carriers may appear healthy, breeding without genetic testing can unintentionally spread the mutation through future generations. By screening breeding dogs before mating, breeders can reduce the risk of producing puppies affected by bleeding disorders while maintaining overall breed health and genetic diversity.
Although there is currently no cure for von Willebrand Disease Type 1, most affected dogs can live healthy and active lives with proper care and management. Preventive measures focus on minimizing situations that could lead to bleeding and ensuring veterinary precautions are taken before surgical or dental procedures. In some cases, blood products or plasma transfusions may be required to control bleeding during emergencies or surgery.
Early diagnosis through genetic testing allows veterinarians and owners to monitor affected dogs closely and prepare appropriate treatment plans when needed. Knowing a dog’s genetic status also helps avoid unexpected bleeding complications during routine medical care.
Testing for von Willebrand Disease Type 1 demonstrates a commitment to responsible dog breeding and long-term canine health. Identifying carriers and affected dogs supports informed breeding decisions, improves breed welfare, and helps protect future generations from inherited bleeding disorders.
