[Carina43]

I can't add a whole lot, you've had some excellent advice - just a couple of thoughts (speaking from similar limited experience, with two different intact males.)

I think he can still learn to interact very well with other dogs - but for now I would just keep those interactions to known dogs who he plays politely with. In class, including the pre-class social time, just don't allow him to interact. Like others said, don't even let him LOOK at another dog until he's learned manners! Later on, once his poor hormone addled brain has calmed down a bit and he's better behaved, he can earn his playtime.

Cooper was a terrible bully at that age, despite pretty much ongoing classes and constant socialization from puppy K on - worse than your guy for a while. It took lots of work to get him well mannered (at a little over two now, he's not perfect but certainly very manageable.) If I had been stricter with him around ALL other dogs when he was going through this stage, I think it would have been much easier, but it was my first time dealing with this behaviour in a male. I was much stricter with Dutch and the behaviour and his manners improved a lot quicker.

He's still got plenty of ways to be social, but until you know he is rock solid around all strange dogs, I wouldn't let him interact one bit....my .02.