Von Willebrand disease (vWD) is the most common inherited bleeding disorder in dogs. Despite being widespread across many breeds, it is frequently undiagnosed until a dog experiences unexpected or prolonged bleeding during surgery or after injury. Understanding what vWD is, which breeds are at risk, and how to manage an affected dog helps owners minimize risk and ensure their pet receives appropriate care.
What Is Von Willebrand Disease?
Von Willebrand disease is an inherited coagulation disorder caused by a deficiency or dysfunction of Von Willebrand factor (vWF) — a large glycoprotein critical for blood clotting. vWF performs two essential functions: helping platelets adhere to damaged blood vessel walls (the first step in forming a clot) and acting as a carrier protein for clotting Factor VIII. When vWF is absent, reduced, or structurally abnormal, the initial platelet plug at a wound site is fragile and breaks apart before the clot fully forms, causing prolonged bleeding. Three types exist: Type 1 (partial deficiency — the most common and mildest); Type 2 (abnormal vWF structure — more severe, rarer); and Type 3 (near-complete absence — the most severe, causing spontaneous bleeding). vWD is distinct from hemophilia, which involves clotting factor deficiency rather than vWF deficiency.
Breeds at Risk
vWD has been identified in over 50 dog breeds. Type 1 vWD is most prevalent and affects: Doberman Pinschers (the most commonly affected breed — estimated 60–70% carry the gene, up to 30% are affected), Scottish Terriers, Shetland Sheepdogs, German Shepherds, Golden Retrievers, Miniature Schnauzers, and Standard Poodles. Type 3 vWD (the severe form) is most common in Scottish Terriers, Chesapeake Bay Retrievers, and Shetland Sheepdogs. Mixed-breed dogs can also be affected, particularly those with significant Doberman or Scottish Terrier heritage.
Signs and Symptoms
Clinical presentation varies widely by type and severity. Type 1 (mild): Many dogs are asymptomatic or show only minor signs — prolonged bleeding from minor wounds or nail trims, prolonged estrous bleeding in females, and unexpected bleeding during surgery or tooth extractions. Types 2 and 3 (moderate to severe): Spontaneous bleeding may occur without obvious injury — nosebleeds (epistaxis), gum bleeding, blood in urine (hematuria) or feces (melena), excessive bruising (petechiae or ecchymoses), and prolonged bleeding from any wound. Severe episodes can be life-threatening. vWD does not typically cause symptoms until the dog is challenged with a bleeding event — meaning many dogs are not diagnosed until their first surgery, dental procedure, or significant injury.
Diagnosis
vWD is diagnosed through specific blood tests. The vWF antigen assay measures the quantity of vWF (expressed as a percentage of normal — most affected Type 1 dogs have levels below 50%). The buccal mucosal bleeding time (BMBT) tests platelet function via a standardized lip cut. DNA genetic testing is available for Dobermans, Scottish Terriers, and several other breeds — it identifies carriers and affected individuals with high accuracy and is recommended for all at-risk breeds before surgery or breeding. Standard clotting tests (PT and aPTT) are typically normal in vWD, as they measure the secondary clotting cascade rather than primary hemostasis.
Management and Treatment
There is no cure for vWD, but affected dogs can live normal lives with appropriate precautions. Pre-surgical precautions: Always inform your vet of a vWD diagnosis before any procedure. Blood type and cross-match in advance, have blood products available (fresh frozen plasma or cryoprecipitate containing vWF), minimize surgical trauma, and use electrocautery where possible. Desmopressin (DDAVP): A synthetic hormone that temporarily increases vWF release from storage sites — given as an injection 30–60 minutes before a procedure for Type 1 dogs; ineffective in Type 3. Transfusion therapy: Fresh whole blood, fresh frozen plasma, or cryoprecipitate provides replacement vWF during active bleeding. Avoiding risk factors: Aspirin, NSAIDs, and some other medications reduce platelet function and should be avoided. Use smooth collars, keep nails trimmed, supervise dog play to minimize bite wounds. Breeding: Dogs with vWD, especially Types 2 or 3, should not be bred. DNA testing is essential in at-risk breeds.
Frequently Asked Questions
What dog breed is most commonly affected by Von Willebrand disease?
Doberman Pinschers have the highest prevalence — an estimated 60–70% carry the vWD gene mutation, with around 30% having blood levels low enough to be considered affected. Scottish Terriers and Shetland Sheepdogs are also significantly affected, particularly by the more severe Type 3 form.
Can a dog with Von Willebrand disease have surgery safely?
Yes, with proper preparation. Inform your vet well in advance of any planned surgery. Appropriate precautions including blood typing, having transfusion products available, desmopressin administration for Type 1 dogs, and minimizing surgical trauma allow most vWD dogs to undergo necessary procedures safely.
How is Von Willebrand disease diagnosed in dogs?
The primary diagnostic test is the vWF antigen assay, which measures vWF levels as a percentage of normal. DNA genetic testing is available for several breeds and identifies both affected dogs and carriers. Standard clotting tests (PT/aPTT) are typically normal in vWD dogs.
Is Von Willebrand disease the same as hemophilia?
No. Both cause bleeding disorders but through different mechanisms. Hemophilia involves deficiency of Factor VIII (Hemophilia A) or Factor IX (Hemophilia B). vWD involves deficiency of Von Willebrand factor, which is needed for platelet adhesion. Treatment and management differ between the conditions.
Can Von Willebrand disease be cured?
There is no cure, but most affected dogs (particularly Type 1) live completely normal lives with appropriate precautions. Severe cases (Type 3) require more careful management and may have more frequent bleeding episodes. Gene therapy research is ongoing but not yet clinically available.