Argh I am so frustrated with Blade at the moment. Ok so I got him as a 10mth old and as far as I gathered, his first owner didnt socialise him as he was too big and bulshy for her and she was too scared to take him out because she couldnt control him. Now hes not 'attacking' other dogs, but he will chase nervous ones that run. And he plays rough with 'new' dogs that want to play but the longer the game goes on, the rougher it gets. He body slams, squashes dogs, holds them down. He is starting to bite down on scruffs and pull them to the ground and hold them down. Hes also a real bully to younger dogs. Dogs that are confident and not interested at all in him, literally ignoring him, he does nothing to them - he will go up and sniff them, then walk off. He doesnt rush or run up to dogs, he creeps like a cat, lies down, creeps a little further, then when theyre real close, he jumps up and stands over them. I can call him away and walk away with him, but it means that he just doesnt get to play with other dogs anymore because he is being a jerk. It is not fair on anyone else at the dog park. Is there any way of training them to play nicely, or are we just going to have to stay away from 'new' dogs? (he gets on great with Mums three dogs and my brothers dog). He turns 3 in November. Just editing as I had a thought: he doesnt smash other dogs over when he is carrying a tennis ball or stick, he wants them to chase him - he thinks its hilarious that he can outrun everyone. Hmm. Maybe I need to carry a toy with me. I have been reluctant in the past as I feel that bringing 'personal' stuff to a dog park could start fights... Maybe it is worth a try?