This leash is fantastic! We use it for our 9-month old 55lb Goldendoodle. She pulls with all her might at times. This leash is being tested. It is holding up well though! We have used this leash for 6 weeks Here are some other things to note:1. The color is fantastic - and slightly reflective.2. This is light, small, and yet holds her well. It is easy for me to maneuver in one hand.3. This costs less than our previous 3 retractable leashes. Yet it is sturdier (and so light). Remember, light does not equal poorly built. This seems to be a correlation some reviewers make.4. The line itself is not flat. This is a rope. This is good for a few reasons: 1) It does not get tangled. 2) It is less likely to have difficulty retracting (which is how 2/3 of the more expensive leaches became less desirable). 3) The line being a rope, and therefore smaller, is also less likely to get urinated on if the leash gets between her legs or under her tail.All in all, I can recommend this leash. It holds a rambunctious 55lb dog perfectly. I imagine it would have no difficulty holding a much heavier dog. It is small enough - and the rope small enough - to hold a much smaller dog as well.If you're like me and have been purchasing a lot of leashes to find the perfect one, then perhaps you have found it in this Flexi. It is exactly what I wanted: a strong and small retractable leash.