“…Similar to wolves, dogs possess a large olfactory epithelium, expanded respiratory turbinates, and a huge number of olfactory neurons and receptors (Green et al, 2012; Köhler, 2004; Zhang, Wei, Zhang, & Chen, 2011). Dogs’ olfactory acuity, that is, their ability to sense chemicals by smell at low concentrations, is excellent (Köhler, 2004; Miklosi, 2007; Vonk & Leete, 2017; Walker et al, 2006 but see also Horowitz et al, 2013), and they can learn to recognize various odors (Hall, Glenn, Smith, & Wynne, 2015; Williams & Johnston, 2002). In detection tasks, they indicate the presence of specific trained odors.…”