Broke after 4 months of use with puppy
I used this product from December 1 to march 15 with my Australian Shepherd puppy. he was 5KG when we got him and 15KG when the line broke. He learned to walk loose leash in end of January, so there is not significant stress on the line.
The line broke at the metal attachment point of the collar whereby it would come unclasped. The puppy ran into the road after breaking free from the leash.
I am a big fan of hunter and believe my experience was a coincidence. we immediately got another line.