I literally have never written an amazon review, but I feel compelled to recommend this harness to anyone who has a dog with mobility issues. I've only had the thing for less than a day and it's completely changed my dog's attitude (and mine!) about the stairs. He's 11, weighs about 45 lbs, and has been very athletic his entire life, but after surgery on his legs two years ago he's lost quite a lot of muscle mass on his back half. Add that to me having a baby this year and being unable to carry him around and up the stairs, and it's made his confidence absolutely plummet. He's been falling up and down the stairs for months, which has made him scared and clearly caused him a lot of pain, and caused me an insane amount of stress because I can't help. This thing has changed that overnight. It's made going up the stairs fun for him again. He's practically flying up with minimal effort from my end. Just a little bit of lift (with one hand!) and his back legs can actually make it onto the steps and find purchase. I'm barely putting any effort in at all! And since I'm able to use it one-handed, I am able to carry my baby around and ALSO help my dog up the stairs. No more screaming baby when the dog has to go potty!I taught this dog how to use stairs when he was little and now this harness has suddenly made going up and down a fun trust building exercise between us again. I hadn't even realized that I missed having those kind of moments with him!It seems well constructed, extremely simple, but it feels sturdy. The support pad is surprisingly firm. I can't attest to the longevity of the harness, but frankly I don't care, because the relief of seeing my dog feel confident again outweighs the cost of buying this more than once if I have to. That being said, I would be extremely surprised if I didn't get a lot of use out of it since it's engineered so that, with my dog's cooperation, the harness doesn't get pulled or strained at all. It's not invasive, since it's really just a big strap, so my dog barely notices it's there and it's not a fight to get him to use it. Plus the simplicity of the design + lack of buckles or anything make it worth the effort to use- kind of a low effort high reward situation, since my dog needs to go downstairs to use the potty so many times a day, it would be extremely annoying to have to buckle and unbuckle him every time I needed to use it.After months of trying to find accessibility aids for my aging dog, this is the first product that has worked perfectly from the jump. It feels like the first real step in regaining my dog's independence.