Von Willebrand Disease in Dogs: Bleeding Risk, Tests and Safe Treatment

By Dr Duncan Houston

Some dogs with von Willebrand disease appear completely healthy until a nail injury, dental procedure or surgery reveals a bleeding problem. A history of previously uncomplicated care does not always exclude it.

Knowing the diagnosis before a procedure gives the veterinary team time to plan appropriate support.

Quick Answer

Von Willebrand disease is an inherited disorder affecting a protein that helps platelets attach at an injured blood vessel. Severity varies, and affected dogs can have normal platelet counts and routine clotting times. Unexplained or prolonged bleeding needs veterinary assessment; heavy bleeding, pale gums, weakness or collapse requires emergency care.

What is von Willebrand factor?

Von Willebrand factor helps platelets form the first plug at a damaged vessel and supports another clotting protein. Low amounts or abnormal function can make that initial seal less effective. This is different from thrombocytopenia, where platelet numbers are reduced.

Types are broadly described as a partial deficiency, an abnormal form of the protein, or a severe deficiency. Breed associations include Dobermans and several terrier, shepherd and pointing breeds, but a breed label alone cannot determine bleeding risk.

What signs may occur?

Possible signs include recurrent nosebleeds, gum bleeding, prolonged bleeding after minor wounds and excessive bleeding during surgery. Some dogs have few spontaneous signs. Trauma or procedures may reveal a problem that was previously unnoticed.

What else should be ruled out?

Low platelets, platelet dysfunction, anticoagulant rat poison, liver disease and other inherited factor deficiencies can also cause bleeding. A local nose, mouth or urinary problem may cause bleeding without a general clotting disorder. The examination and blood tests help distinguish these.

How is vWD diagnosed?

A von Willebrand factor antigen test measures the protein level. DNA testing can identify specific variants in breeds where a relevant test is available, but genotype does not fully predict the severity of every dog's bleeding. Results must be interpreted with clinical history and the type of disease.

Cornell's coagulation laboratory guidance explains testing and treatment. Normal routine clotting times or a normal platelet count do not rule out vWD. Do not attempt a bleeding-time test at home.

When is this an emergency?

Significant bleeding or weakness in an affected dog needs immediate assessment. Keep the dog quiet and apply steady pressure to an accessible external wound with a clean cloth. Do not repeatedly lift the cloth, pack material into a bleeding nostril or give human medicines. Phone ahead so the clinic can prepare.

What treatment is available?

There is no routine medicine that permanently corrects the inherited defect. Blood products containing von Willebrand factor may be needed for substantial bleeding or selected procedures. Desmopressin can help some dogs with type 1 disease but is not effective for every type or every patient.

Discuss pain relief with the treating vet. Aspirin and other drugs can increase bleeding concerns, but replacing them with an unprescribed human painkiller is not safe. Procedure planning should include how bleeding would be managed if it occurs.

Home care, mistakes and prevention

1. Keep the diagnosis and laboratory report available to every treating clinic.
2. Choose lower-injury activities and supervise chewing and play.
3. Ask before any medication or supplement is added.
4. Tell groomers about the condition and discuss careful nail care.
5. Use breed-appropriate testing and genetic counselling before breeding.

Common mistakes include assuming a “carrier” result is always irrelevant, overlooking previous bleeding history and arranging elective surgery without warning the clinic.

Frequently asked questions

Can a dog with vWD have surgery?

Often yes, with an individual assessment and preparation for bleeding risk.

Does every affected dog bleed severely?

No. Severity varies by disease type and individual factors.

Is vWD contagious?

No. It is an inherited disorder, not an infection.

Advance planning is the main advantage of knowing the diagnosis. Share the information before a procedure rather than after unexpected bleeding starts.

Explore ASK A VET™ for information about ongoing care. Heavy bleeding, weakness or collapse needs urgent veterinary treatment.