The testing room set-up was based on Broom et al. (2009) and contained a 1 m tall 1.5 m wide freestanding mirror, positioned on the floor. The center of the mirror was attached to a 1.5 m tall 1.5 m wide opaque barrier at a 90
angle to the mirror, also positioned on the floor (see Figure). There was a space of 9 cm separating the barrier from the mirror, which was covered with transparent hard plastic. This permitted the dogs to see the reflection of the area on the other side of the barrier but not to move between the barrier and the mirror. The floor of the room was marked with masking tape to divide the room into 4 different areas, including the area nearest the door, the area behind the mirror, the area where the treat would be located, and the area where the dog would begin the testing phase, as shown in Figure. There were dog treats (You’ll Love Coles brand beef liver strips; Coles, Glen Iris, Victoria, Australia) placed in 5 different and inaccessible locations throughout the room, and 2 fans in the room were used to disperse the scent of the treats, thus making it more difficult for the dog to localize the scent of the target treat used during the testing condition. The hidden treats were identical in size and type to the target treat.
The testing room set-up was based on Broom et al. (2009) and contained a 1 m tall 1.5 m wide freestanding mirror, positioned on the floor. The center of the mirror was attached to a 1.5 m tall 1.5 m wide opaque barrier at a 90
angle to the mirror, also positioned on the floor (see Figure). There was a space of 9 cm separating the barrier from the mirror, which was covered with transparent hard plastic. This permitted the dogs to see the reflection of the area on the other side of the barrier but not to move between the barrier and the mirror. The floor of the room was marked with masking tape to divide the room into 4 different areas, including the area nearest the door, the area behind the mirror, the area where the treat would be located, and the area where the dog would begin the testing phase, as shown in Figure. There were dog treats (You’ll Love Coles brand beef liver strips; Coles, Glen Iris, Victoria, Australia) placed in 5 different and inaccessible locations throughout the room, and 2 fans in the room were used to disperse the scent of the treats, thus making it more difficult for the dog to localize the scent of the target treat used during the testing condition. The hidden treats were identical in size and type to the target treat.
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