Pongrácz P, Gómez SAlvarez, Lenkei R. Separation-related behaviour indicates the effect of functional breed selection in dogs (Canis familiaris).  2019.

Parsons CE, LeBeau RT, Kringelbach ML, Young KS. Pawsitively sad: pet-owners are more sensitive to negative emotion in animal distress vocalizations. Royal Society Open Science. 2019;6(8):181555. Available at: https://royalsocietypublishing.org/doi/10.1098/rsos.181555https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.181555.