Teaches your dog to obey using the principle that a dog's body will follow where his head leads him. More humane than other training collars and leads. Measure around mid-point of snout.
This were first recommended to me when I had an Irish Wolfhound rescue who was perfect on leash until he saw a cat. I was no match for 170# of excited torque and this worked like a dream. Flash fwd several years to my extremely stubborn, frustrating 80# Gold Ret mix. After Sporn halter, Sporn head halter, & persistent training, I am right back to the Head Halti. Simply the most effective I've found.
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