SEEMS LIKE A GREAT PEN FOR MY DOG, BUT THE DIRECTIONS WHERE VERY PLAIN ON HOW TO PUT TOGETHER. KEPT LOOKING AT ALL THE PICTURES TO TELL ME HOW TO DO IT. SEEMS LIKE THE PLACES THE BOLTS GO, THEY NEED TO BE LONGER TO FIT THRU THE HOLES . DID NOT SAY TO DRILL ANY HOLES OR WHERE TO DILL, JUST SHOWS A ICON OF A DRILL ON THE DIRECTION SHEET.