Several studies on human-robot interaction have shown that when children and adults encounter social robots they make use of ‘dynamic’ categorization in the sense that ascription of e.g. mental states, biological properties, sociality and moral status are context dependent. In the context of a minor pilot study, with the aim of comparing results with those of the larger studies that have been undertaken among American children, I tried to explore the claims of ‘dynamic’ categorization among some Danish schoolchildren at Løsning Skole. Based on the findings, which showed a change of reference to the social robot NAO over time and situation, the pilot study suggests that the schoolchildren's categorization of NAO could be ‘dynamic’. Taken that the findings seems to confirm that categorization is context dependent, I will in the discussion consider the philosophical implications of the ‘dynamic’ categorization claims for (i) ontology and our understanding of categories, and (ii) for the epistemology of classificatory descriptions and its relation to concepts of rationality.