Hi guys, I'm new to site due to a slight problem. I've got a pb (Blackjack - BJ) who's turned very agressive towards other dogs, his only young, maybe under a year but big & strong. I'm now worried about taking him anywhere. I ended up with him cos my ex suddenly appeared with him one day in pretty bad state, wouldn't and still won't tell me where he came from and since then the ex is now the "not talking to me" ex and I'm left with BJ!!! I've had him a couple of months, think he's wicked!!! Any suggestions?