... Positive psychological outcomes such as increased feelings of wellbeing, selfefficacy, happiness, cheerfulness and relaxation were reported in almost half the studies reviewed (N = 27; 43.5%), as well as a decrease in depressive symptoms, anxiety and stress levels (Enders-Slegers, 2000;Hecht et al., 2001;Suthers-McCabe, 2001;Becker and Morton, 2002;Likourezos et al., 2002;VanZile, 2004;Mallia, 2006;Motooka et al., 2006;Tatschl et al., 2006;Chur-Hansen et al., 2008;de Guzman et al., 2009;Hargrave, 2011;Culbertson, 2013;Gretebeck et al., 2013;Himsworth and Rock, 2013;Putney, 2013Putney, , 2014Johansson et al., 2014;McNicholas, 2014;Bennett et al., 2015;Mayo Clinic, 2015;Zane, 2015;Branson et al., 2016;Yang et al., 2017). Pets could also decrease the stress associated with grief following the loss of a loved one (Wells and Rodi, 2000;Suthers-McCabe, 2001;Dice, 2002;Hara, 2007;Culbertson, 2013;Putney, 2013;McNicholas, 2014;Anderson et al., 2015). Almost half of the studies (N = 30; 48.4%) also reported benefits relating to the social dimension, such as pets being a source of unconditional love and reducing the feelings of loneliness and isolation by providing companionship and/or fulfilling the need to feel needed (Wells and Rodi, 2000;VanZile, 2004;Hara, 2007;Scheibeck et al., 2011;Shibata et al., 2012;Johansson et al., 2014;McNicholas, 2014;Stanley et al., 2014;Bennett et al., 2015). ...