I teach my clients to use a Gentle Leader. It goes over the nose and behind the head one finger snug. Of course you just can't slap one on and expect the dog to respond. I use several sessions of placing on the nose and then click in treat. I do short sessions until I can clasp the halter around the head. Then still short lessons with walking a small distance in the house and praise,praise praise. and click and treat. I also teach your basic sit stay and or wait command so that any time you cross a bicycle, other person, dog, etc the dog can be on a sit command.

https://www.youtube.com/watch?v=_y3sjc1yY50 (https://www.youtube.com/watch?v=_y3sj...)