Distinguishing Doors and Floors on All Fours: Landmarks as Tools for Vertical Navigation Learning in Domestic Dogs (Canis familiaris).

Simple Summary: Terrestrial animals, including humans and domestic dogs, naturally create cognitive maps in the horizontal plane in order to navigate; their navigation in the vertical plane is poorer, given their land-based locomotion. For humans, the development of multi-story buildings highlights this difficulty in mapping vertical space: for instance, on an elevator, humans typically rely on visual information about the height of the landing—floor numbers, e.g.,—to know where they are. However, human companions, domestic dogs, cannot rely on number cues, and do not appear to reliably know when the elevator has stopped on their home floor. In this study, we examined if dogs can learn what floor they are on based on a visual or odor cue on their floor, similar to humans' use of a number cue. The subject dogs were able to do so, with some caveats. Our results suggest that cues may help dogs navigate an anthropocentric environment. Spatial navigation allows animals to understand their environment position and is crucial to survival. An animal's primary mode of spatial navigation (horizontal or vertical) is dependent on how they naturally move in space. Observations of the domestic dog (Canis familiaris) have shown that they, like other terrestrial animals, navigate poorly in vertical space. This deficit is visible in their use of multi-story buildings. To date, no research has been conducted to determine if dogs can learn how to navigate in an anthropogenic vertical environment with the help of a landmark. As such, we herein investigate the effect of the addition of a visual or olfactory landmark on dogs' ability to identify when they are on their home floor. Subject behaviors toward their home door and a contrasting floor door were compared before and after exposure to a landmark outside of their home door. While subjects initially showed no difference in latency to approach an apartment door on their home or a wrong floor, we found a significant difference in latency to approach the doors in the test trials for subjects who approached the doors in every trial. Other findings are equivocal, but this result is consistent with the hypothesis that dogs can learn to navigate in vertical space. [ABSTRACT FROM AUTHOR]