A spin-off of the Original Sporn Halter®, the Big Dog Halter™ is designed specifically for large breed dogs who are aggressive leash pullers! It is guaranteed to stop your dog from pulling using the patented "Sporn Effect". It's easily transformed into a standard collar when the pull-control function is not needed. All materials and components are made of the highest quality nylon and nickel-plated hardware to reduce weathering.