Caution is in order when using a head collar on a dog who is likely to pull on it. Serious neck injury can result from even MILD pulling by a dog wearing a head collar.
http://www.spiritdog.com/animalwellnessHeadGames.pdf
I would be more inclined to recommend a front clip harness.
http://www.spiritdog.com/animalwellnessHeadGames.pdf
I would be more inclined to recommend a front clip harness.