[Flyndaran]

It is odd how Disguise Animal assumes every other life form uses scent. While some like bears, deer, and rhinos have far more acute olfaction than dogs, some rely purely on vision. Birds don't care how much we apes stink, and neither do giraffes, I believe.
And to give a weird response, back before diabetes knocked out much of my sense of smell, one would need to disguise their scent from me, to a degree. Specifically, some humans can detect sex, age category, major aspects of diet, general health, if sleeping or recently awakened, and a few other aspects under optimal conditions.
At the risk of offending some, I could also detect something that only bisexual women give off, and something else that only non-gay men give off with very few exceptions.