I bought this leash for our 1-year-old Borador (Border Collie/Labrador Retriever mix) who is about 50 lbs. He loves the extra line he gets at the park without me having to worry about him running away. We have only had him for about 2 weeks and this is very necessary for training outside when he is ready for more distractions. Also a good way to play with him and run out all of his energy.The leash is fairly thin, but sturdy and seems generally well built. I only rated it a 4 star because it has kind of a rough texture in your hand which isn't the most comfortable. In fact my fiance wasn't paying attention and he took off running while she was loosely holding the leash. The leash gave her really bad rope burn and her fingers were all blistered for a few days. If you are going to use this leash just make sure you keep a snug grip on it, or wear some gloves to help protect your hands.Other than that it's a 50 ft leash which does it's job.