Great Danes are a lot of trouble. More than the average dog owner will tolerate. To begin with when they poop, it's like a horse or cow. Huge. The only thing we were ever able to do with ours was go and take about two shovel scoops out of the ground next to it then turn a scoop from directly underneath the sod it sat on and turn it upside down while putting it in the hole. Then cover it with the dirt ya scooped out. The result is a lawn that has huge clumps of really healthy clumps of grass here and there all over the yard.
We had a styrofoam head the wife kept her wig on back when she had one for just such purpose. The Dane decided that it was evil and if ya put it out anywhere he could see it he would stand right in front of it raising hell til ya put it up. Ya had to lure him out of the room before ya put it up cause if you stuck it on the top shelf in the closet and closed the door and he knew where it was he would stand there and bark at the closet door.
We got him as a puppy. He was in a shoe box. When we went for a ride he would sit in my lap. When he weighed 200 pounds he still wanted to sit in my lap.
When small he would run under furniture (coffee tables and the like) When he got older he would run into the same furniture and turn it over. Didn't know what was wrong with the furniture. He certainly hadn't changedc