how do i stop my dog barking at other dogs and wanting to play with every dog we meet

Hi - it would help if you registered because you haven't really given us anything to go on! The method of stopping it depends on the reason it's happening. How many dogs does he get to play with every day? What do you do when he barks? What sort of bark is it?

Sorry, a lot of questions, but all essential to get a background of the behaviour.