Callie has a swimming routine. She retrieves her "floating" frisbee, swims to shore, climbs up some stone steps, runs across a "party pad", gangway, and boat dock, drops the frisbee for me to throw, and then jumps in the water to retrieve it again. Yesterday, she got all the way to the end of the dock without her frisbee. With only a little encouragement, she ran back to where she had left it on the steps, ran back to the end of the dock, and put the frisbee down for me to throw. What kind of "thinking" or "Intelligence" is this? Is it common in dogs?