There are two types of gentle leaders the harness and the head collar.

If you do decide to use the gentle leader head collar make sure to condition your dog to the head collar before you attempt going for a long walk.

I would suggest taking a bunch of treats and the collar. Put the collar on ( make sure that it is on correctly) but make sure that you have treats in hand so that you can feed your dog as soon as you put it on or they will try to take it off. Once you feed your dog a good amount of treats with the head collar on, take it off. Refrain from giving treats when the head collar is not on. Put on and take off the collar 3-4 times giving your dog treats only when the collar on. This way they associate the head collar with treats ( good things). I would do this numerous times on separate occasions before you attempt to go on a normal walk with the head collar on. They may still protest a little but keep their head up and keep them moving forward and they should soon forget about it.

A head collar is a different thing for dogs and many people disregard this wonderful tool just because their dog "doesn't like it" and tries to take it off, when they didn't even give their dog a chance to like it.

Both of my Australian Shepherds were trained on head collar gentle leaders. My dogs walk very well on the leash and I no longer have to use the head collar, so it was a success for me. GOOD LUCK!