Probably the most valuable thing I own for my puppy. I had a 24" but as her legs got longer she was able to eventually jump over it if she had enough motivation. The 36" is definitely taller and heavier than I expected, but with that comes sturdiness and security. You definitely can't step over it like you could the 24". One thing worth noting is that the panels on this CANNOT be separated! My last pen had rods connecting each of the panels, some which I would remove to block a doorway, both sides of the porch, etc. These are all connected which isn't ideal if you are trying to make this not only a pen but also a gate to block multiple parts of a room. Other than that this was a great purchase.