Hereditary bleeding disorders including hemophilia A and B affect several dog breeds, causing potentially severe bleeding episodes that require careful management and informed breeding decisions.
Hemophilia welfare impacts range from subclinical to severe depending on the specific factor deficiency and its severity: mildly affected dogs may only show prolonged bleeding from wounds, while severely affected animals experience spontaneous bleeding into joints, muscles, and body cavities causing intense pain. Joint bleeding (hemarthrosis) in particular causes acute severe pain and, with repeated episodes, chronic joint damage and arthritis. Routine procedures like vaccination, spaying, and neutering become high-risk events requiring pre-planning and sometimes prophylactic plasma treatment. Owners of affected dogs face ongoing anxiety about any injury, and activity restriction may be advised despite the behavioral welfare cost of limiting exercise. The preventable nature of these conditions through genetic testing makes continued breeding of carrier animals a welfare concern - breeds with high carrier frequencies have established testing programs, but adoption is not universal.