Possible explanations for this result could be individual variability in the perception of the absence of the owner as a potential trigger for anxiety in the dogs or in the fluctuation of CoP concentration in different dogs in phases 1 and 2 of the test (as suggested by the wide variance in the CoP concentration in both groups), and/or actual absence of interaction of SRPs with copeptin variations as a contributor to anxiety. This evidence concerns the gene AVP and Anxiety.