I can't offer much advise, seeing that the phenomenon 'dog parks' is unknown where I'm from. We have unfenced off leash areas for dogs, and that's it
Good recall is pretty much essential.
If you don't trust the situation at the dog park, perhaps the best decision is not to bring him there anymore. Maybe you can find another off leash area for your dog to romp around?
Adding another dog is something I'd only do if you yourself would feel ready for it (financially, enough space, and enough time to devote) and of course, if the current dog is (preferably more than) okay with it. But the latter doesn't sound like a problem for Wesley
But I don't know if adding another dog is a solution to your problem.
If you don't trust the situation at the dog park, perhaps the best decision is not to bring him there anymore. Maybe you can find another off leash area for your dog to romp around?
Adding another dog is something I'd only do if you yourself would feel ready for it (financially, enough space, and enough time to devote) and of course, if the current dog is (preferably more than) okay with it. But the latter doesn't sound like a problem for Wesley