Dog Health Questions: Dog Training, Do ultrasonic sounds work?

I have a very big puppy (if you don't believe me check out my other question it has pictures). He gets very excited to see people and jumps on them. I've tried a few things to correct this and people have been okay with it. But I'm not! He could hurt someone or they could just claim he did and he could be taken away. He's on a leash but he looks like a pit so when he jumps on someone or pulls me it could scare someone. I do allow him off the leash in legal areas to do so and he does comes to me but when other people come around he just has to greet them.
I'm considering getting something called Pet Zoom to fix this issue. It sends out a sound only animals can hear. Has anyone ever tried something like this? It's a pain free training method.

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I have something similar, and it works with some dogs, but not with others.....I mostly use it when a dog does not respond to me telling him to stop barking.

I would think a properly fitted prong collar would be more effective for your purpose.

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• If i cannot hear it, how do i know it is working? Keep the dog on a leash at ALL TIMES until you have this trained out of him. A good knee to the chest usually works well if done right the first time and popping the leash when he is about to jump.