Originally Posted by Joey.E.CockersMommy
Here is what I found
I think it's worth adding to this, since I don't think it was mentionned anywhere, that if the dog gets so focused on whatever it's reacting to, you need to move back and find the dog's threshold. By this I mean, find the distance at which the dog can see the other dog, but is not so wound up that they cannot accept treats.
As you make progress, you can close the distance between your dog and others until you're able to pass a dog on the street, for example, without having a little doggie hissy fit.