When the nose knows: ontogenetic changes in detection dogs' (Canis familiaris) responsiveness to social and olfactory cues

Domestic dogs, Canis familiaris, are highly responsive to human communicative cues and can utilize gestures, such as pointing, to locate hidden rewards. This ability is thought to be the product of both genetic and behavioural selection, allowing dogs to adapt to life with humans. Dogs' responsiveness to human gestures can also lead to suboptimal choices when dogs readily follow misleading cues despite directly contradicting perceptual information such as odour cues. However, this bias likely reflects pet dogs' enculturation with humans and thus may not be representative of other populations of dogs. We investigated the ability of young dogs in training for explosives detection (N = 77) to locate a hidden reward using olfactory cues when presented in conflict with a deceptive communicative gesture in an object-choice task. We assessed performance at 3, 6 and 11 months of age using both cross-sectional and longitudinal designs. We found that, contrary to previous findings with pet dogs, responsiveness to human pointing decreased with age, whereas the ability to locate the reward by scent increased. Furthermore, a lack of susceptibility to deceptive social cues was predictive of future success as a detection dog. These findings further indicate the influence of ontogenetic effects on canine social cognition and demonstrate potential applications for the identification of suitable detection dogs. (C) 2019 Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour.