The leash is made out of 550 paracord.. It is made out of two strands double over to make a weave wiith 4 cords. . Since it is made basically with 2cords you shou;ldn't have to worry about the cords coming apart or tearing. this paracord weighted at 550 lbs. I believe when woven together it can handle more weight. I think it could very well handle a large size dog but I can't gareeteed it. You can look up paracord information to make sure.. I hope this helps.