There is the Gentle Leader Headcollar that goes on the head of the dog and over the snout. It discourages pulling, but many people find that it rubs their Boxer's snouts because of the short, upturned muzzle of Boxers.
There is the Gentle Leader Easy Walk Harness that is a front clip harness that also discourages pulling.
Both products are made by Premier. The Gentle Leader Easy Walk Harness is commonly referred to as both the "Easy Walk Harness" and the "Gentle Leader Harness".
Thanks Two Dogs! For awhile there I thought I had purchased the wrong thing...thinking I had bought the Gentle Leader and then realized the name actually said Easy Walk Harness. I did do a search online by the manufacturer...but couldn't tell from the photos what the real difference was. I think the only thing I need to change is getting a bigger size.
Next question: Is this tool to be used only to get them to learn to start walking better on a leash and then you can go back to just using your normal leash...OR...does this device need to always be used. (I guess it would depend on the dog...now that I think about it.)