von Willebrand's disease (vWD)
This is the most common inherited bleeding disorder in dogs. It causes defective blood clotting due to reduced amounts of von Willebrand's factor (vWF) a protein which helps tiny blood cells called platelets to adhere to each other and form an effective blood clot in the body.
Many breeds may be genetic carriers of this trait, but problems are most likely to be seen in Doberman Pinschers, German Shepherd dogs and Labrador Retrievers. Both sexes are affected equally.