The Key Is in Their Nose
Our body odor often changes when we’re sick. Some people with diabetes are described as smelling slightly like rotten apples, which is caused by low concentrations of acetone in their breath, per CNN. Meanwhile, people with yellow fever are said to smell like a butcher’s shop. These scents, which can be subtle, may not always be apparent to other people, but dogs are well-equipped to suss them out.
