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Recent ethological studies on the interactions between man and his pet dog, have shown different analogies bétween the behavioural mechanisms developed during intraspecific and interspecific proximal relationships. This study characterizes new analogies between sniffing, licking and rubbing behaviours of familiar dogs, directed towards the urban environment, their conspecific and their master. The results emphasize the importance of the synergic relation between the exploratory sniffing and tasting behaviours. Different hypothesis are put forward concerning the functions of these behaviours developped by dogs during their social interactions and their importance in relations between humans and animals.