My father-in-law first taught him to jump over their hedges; at 3 to 4 feet high. Then when I'd bring him to my Army unit office, some of the G. I.'s wood take him for outings.
They were also teaching him to run toward small shandies to jump up onto their roofs. Some were 8 feet high and higher. I didn't realize it until I caught them doing it with him.
He loved it!
George Klacik (In the 1940's when I was an Army Co. Comdr.)