Lay out 5 different pieces of paper, mats, etc: purple, lime green, pink, yellow and orange. Put a little treat on each piece of paper. Hold the dog about 5 feet away, then tell her to go ahead and get the treat. See which paper she goes to first. Rearrange the row of papers, repeat 6 times, rearranging the order of the colored papers each time.
In this trial, Harley picked the orange card first.
In this trial, Harley picked the purple card first.
In this trial, Harley picked the purple card first.
In this trial, Harley picked the pink card first.
In this trial, Harley picked the pink card first.
In this trial, Harley picked the green card first.
Harley seemed to prefer the treats on the purple or pink paper.
Harley generally went from left to right.