As such, the line is very good, because you can vary the line with different extensions. For smaller dogs, I find it suitable, however, for larger I find the material is not very good on the strength. I myself have an Aussie and a Great Dane. If both are on a leash and run in different directions, because they have something in the nose, it constricted but neatly into the hand. As my Great Dane has granted to early times against the line (so far I've run with two lines) he has nibbled off, which have left marks quickly. Meanwhile, I have given the line of my neighbor with two small Maltese and this is satisfactory. Thus, my conclusion: For smaller dogs, the leash is a useful companion, suitable for larger dogs in my opinion, not very good.