Child of a Metal God

There would have to be something seriously wrong for there to be enough of the stinky compounds in it to produce a noticeable odor. Blood's viscosity would mask odor, blood contains components that aren't removed by the kidneys which themselves have a characteristic odor, and part of the effect of the kidney is to concentrate the compounds it is removing in urine. You go from a tiny concentration in a thick liquid with lots of uh.. hematological febreze, to a high concentration in an aqueous solution that is then almost aerosolized. You'd need to be a dog to pick up the smell in blood I suspect. Or have blood that is very unusually composed due to some physiological badness.