She had to choose the right pot, which stood always in front of the box. On the 3. photo she begged for a piece of sausage by the tester

In the pipe there was a piece of sausage. The tester showed her, how she can reach the sausage, either she can pull the pipe or the rope on the pipe.
She was the only one, who pulled the rope every time (twice)

In the box was a piece of sausage: the tester showed her, how she can open the box: she had to pull the little arm on the side of it. There were just few dogs, who could solve this really difficult test. One of them was our blondy dog lady :-)))