The current study was designed to examine whether preschool children categorize picture stimuli differentially in the presence of a real dog compared with a stuffed dog or a human. Seventeen preschool children (age in months; M = 51.67, SD = 8.06), both Typical and those with a developmental delay ("Identified"), were asked to categorize Animate and Inanimate objects into two environments (Farm and Ocean) in each of three Collaborator conditions (Real Dog, Stuffed Dog, and Human). As predicted, there was a main effect of animation: the children more accurately categorized Animate (e.g., cow) exemplars than Inanimate ones (e.g., tractor). Additionally, the Animation variable interacted with Collaborator, such that in the presence of the real dog the impact of animation was significant, but this effect was not significant in the presence of the stuffed dog or human. This result indicates that the presence of the real dog served as a highly salient stimulus which encouraged the children to focus more of their attention on other animate objects in the list. This result provides additional evidence that the presence of a dog helps preschool children to restrict their attention to the demands of the task. This is a new and interesting finding that indicates that the presence of a real dog does have an impact on cognitive task performance.