Excited barking/screaming at other dogs?

by Gina
(UK)

I have 2 Parson JRTs (one 12 and one 2 years old). The younger one has always been extremely excitable (the vet described him as perhaps having mental issues) who is very demanding but extremely lovable. We have problems when walking him because he yells and scretches when he sees almost any dog. He jumps and pulls and twists the whole time. I think he wants to go and play but other dogs don't like his behaviour. We did take him to training classes as a puppy but spent most of the time stood outside the door because of his barking. He goes crazy at people walking past too and now just stands and barks at us if he wants anything from going for a walk to us to wanting to sit on our knee. He hasn't really learnt to solcialize with other dogs and I naively thought that he didn't need it because we had another dog here (plus we had a spell where they had a couple of fights although this has resolved itself and they seem happy together now). I need to find a way of walking him without the embarressing and physical difficulties of him going mental every time he sees a dog in the distance plus I feel really nervous when he is throwing himself towards Rotweillers and Alsations. Basically HELP! Any suggestions please?