Nick- part mountain goat?

This is what I saw out my kitchen window-yikes!  Nick is definitely my chair dog.  He loves to get up in lawn chairs and hang out.  He seemed quite proud of himself and seemed like he was happy I saw that he was up there.  This was taken through the screen.                  

Then I went outside the porch to try and get another but he got excited with the others running over toward me.  And yes, he lept off!  Of course I gasped!  He was just fine and actually launched himself enough that he did not dive onto his front.  He almost landed with all 4 at once.  Need to move the chairs!