I love the metal reinforced loop that is built into the harness, I know that there is no way my pitbull/malamute cross puppy will be able to break it.
The harness does a really good job with securely correctly and fitting well without sacrificing mobility. I also love that there's a built in handle thats strudy and we'll made- i use this to assist the puppy getting in and out of the SUV since her jumping isn't the most accurate yet.