Dogs recognize their owners through sight and smell. Dogs can also detect some diseases or the onset of seizures, likely through metabolic changes associated with the disease. [Credit: Airman Rhett Isbell]
Read more at
N. R. Gough, The Scent of Parkinson’s Disease. BioSerendipity (16 Mary 2019) https://www.bioserendipity.com/the-scent-of-parkinsons-disease/