I have a 94lb american bully and use this leash during protection training. She is simply tied to a post with this leash and asked to pull and lunge toward the decoy as hard as she can. The leash has no problem holding back her or my 70 lb male who is the black pup pictured above at 7 months old. I have no doubt once he is full grown this leash will have no issues holding him back as well. Great customer service from tuenne each time I place an order. Just order my second tie out leash as a gift for my trainer since he liked it so much.