Urine supernatant from 86 dogs with MPGN/mixed MPGN (n=40) and non‐MPGN (n=46) (membranous glomerulonephritis (n=12), amyloidosis (n=15), focal segmental glomerulosclerosis (n=12), mesangioproliferative glomerulonephritis (n=6), and podocytopathy (n=1)), were probed with Human ApoB100 antibody. This evidence concerns the gene APOB and primary membranoproliferative glomerulonephritis.