Originally Posted by Nina

I have said this numerous times with regard to training and behaviourists. What works for one dog, may not work for another.

It must be extremely frustrating for you. Normally, I do not like to offer advice to anyone with aggression problems, since I think its something for a professional, and not a forum. However, what it he motivated by? Is it toys, or food?

You could try taking out some food (sausage, ham, cheese etc), and before your dog sees another dog, get his attention with said treat. As the dog approaches offer the treat, so he begins to associate something nice with an approaching dog. It certainly is worth a try.

Best of luck