Walking on leash problems?

I had a similar problem with one of my dogs. The only thing that worked was a prong collar. It's not meant to be worn tight. It needs to be a little loose. Also, no constant pressure or she will get used to it. You need to do a quick pop and release and only when she pulls. My boy learned very quickly that he would get to go meet the new dogs or people, but he needed to walk calmly at my side before he was allowed to do so. I only had to use the prong collar for a few days before he was walking like a perfect gentleman. I know they look bad. I always thought that too. Until I spoke with a vet who specialized in behavior. He told me to put the collar on my forearm and do the pop and release. It didn't hurt at all. It's not meant to. It's supposed to be like when you tap someone on the arm to get their attention.