Description of conditions administered in the test half of sessions.

Prior to the test half, subjects were tested in a baseline condition where, with one exception, both subject and partner were rewarded for approaching the plate. In the Non-Social Control 2 (NSC2) condition, the baseline was run in the absence of a partner dog and thus food was simply placed on the partner’s plate. Food was always absent from subjects’ plates during tests. A single unit of reward (note that reward type varied between dogs and dingoes) was used in all cases.