In a recent post, I discussed the issues I have been experiencing as G's limp has returned and we've needed to try out alternative collars. As noted, we had been using the standard martingale collar, but G's sheer strength and determination (if that's what you want to call it!) left me feeling less than secure while navigating in the streets. Basically, she would just lean her body weight into a direction she wanted to go and that was that!
I caved and finally pulled out her Gentle Leader head collar. We have stopped using it for some time as it had left a mark on G's snout, people thought it was a muzzle and G had general discomfort (ie she was always trying to take it off - sometimes successfully).
Well, let me tell you, I'd forgotten how great this tool was! For G, it has curbed not only her pulling and random sniffing, but she's now walking easily and sans limp on a slack leash. Her barking on leash, especially in our apartment lobby has decreased ten fold, as well.
I don't know that I will ever not use this collar based on the confidence it's given both me and G in our walks - a success story!