An 8-year-old male Austrian Pinscher and a 14-year-old male Golden Retriever were presented for evaluation due to unexplainable high fructosamine values despite euglycemia and epistaxis in combination with polydipsia/polyuria, respectively. Blood analysis revealed severe hyperglobulinemia, hypoalbuminemia and markedly elevated fructosamine concentrations in both dogs. Multiple myeloma with IgA-monoclonal gammopathy was diagnosed by serum and urine electrophoresis including immunodetection with an anti-dog IgA antibody and bone marrow aspirations. Diabetes mellitus was excluded by repeated plasma and urine glucose measurements. Fructosamine values were positively correlated with globulin, but negatively correlated with albumin concentrations. These cases suggest that, as in human patients, monoclonal IgA gammopathy should be considered as a possible differential diagnosis for dogs with high fructosamine concentrations.
Animals Blood Proteins/analysis Dog Diseases/blood* Dog Diseases/drug therapy Dogs Fructosamine/blood* Immunoglobulin A/metabolism* Male Melphalan/therapeutic use Multiple Myeloma/complications Multiple Myeloma/drug therapy Multiple Myeloma/veterinary* Myeloablative Agonists/therapeutic use Paraproteinemias/blood Paraproteinemias/complications Paraproteinemias/drug therapy Paraproteinemias/veterinary*