Aggression towards other dogs?

So I've had Dragon (my staffy) for 2/3 months and he's 2 years old.
When we first got him we made sure that he'd be ok with another dog since I had a 4/5 year old labrador and we didn't want them two to fight, so we got Dragon to meet my Labrador and they got on just fine, they're like best friends they get all excited every time they see each other and they hate not to be together now a days.

But once I was walking Dragon and another Staffy out of the lead came up to him and his owner was no where to be found so I was panicking not knowing what to do since Dragon at that time had never met another dog apart from my Labrador and I didn't know if the other staffy was friendly or not, so they sniffed each other and nearly had a fight so I pulled Dragon away and tried to walk away from the situation because it seemed like it would of got rather nasty, if I did let my dog stay there.

Since that day Dragon has changed rather a lot...

We normally take him to a big park where a lot of people walk there dogs, we always put him on the lead if any other dog comes anywhere near him. So we were playing one day and we seen another dog and like we normally do, we put him on the lead and warned the other owner that our dog might not be ok with other dogs, the owner was rather nice and said ''It's ok I'll bring my dog over, your dog needs to socialize'' I then said to him that I'd rather not since I wasn't to sure what my dog would do, he still wanted to try ''help'' us getting our dog more friendly, so he came with his dog and they sniffed each other for about 10 seconds and then my dog jumped on his dog and bite him, luckily my dog was on the lead so I pulled him away straight after he bite it, the other owner was very nice and told me it was ok and said my dog was very good looking and kinda just walked away, I felt really bad.

A few weeks after we were playing and this one women was walking her dog and throwing her dogs ball right near my dog, she was saying that my dog had a stupid name and all. I was getting really angry at that women at the time since my dog means the world to me. My dog didn't seem to care to much about her dog so I decide to keep playing, I throw my dog's ball and he runs to the ball, he picks up the ball and as he's running back he drops his ball and starts running towards that women's dog, I tried to run after him to stop him but he was way to quick, as soon as he got to the other dog he jumped on the dog and started biting it like crazy, I didn't know what to do because I had never seen my dog like that, he went completely crazy and I was feeling so bad until she starts punching my dog and saying ''This dog is an evil breed!!'', I was actually going to apologize to that women but after what she did I didn't think she deserved an apologize, I know what my dog did wasn't right but she has no right to punch my dog as she seen me running after my dog to grab him and stop the fight, luckily my dog at that time had never played tug of war, he didn't know how to bit, he'd bit and let go straight after and then run again and bite, but this was not playful at all, now that he's getting into playing tug of war more, I'm getting rather scared since he's biting power is getting way to strong, he destroy a ball with 1 bite last night and he didn't use to before and also he doesn't just bite now when he bites he holds it, so I'm getting scared that he runs after another dog and bites it.

I don't understand why he attacks other dogs when he's completely fine with my Labrador, and he doesn't just attack 1 dog, he attacks any dog (small or big any breed of dog he attacks) apart from my other Labrador who he only met 2/3 months ago.

Well I'm posting this to see if anyone has any suggestions on what to do to try get him to be ok with other dogs, I've tried walking him with other dogs and tell him off when he tries to run after the dog, he stops for a little bit then after a while he runs after it again.

Some staffies just won't get along with other dogs. He also could have had a bad experience in his past. Walking him with other dogs is one of the best things to do. You can also try using a long lead so he can roam a bit and still maintain control

Yes he's been acting very weird lately when he sees another dog.
When I first got him, he didn't care.
After a while he started pulling, but when I pulled him back and told him off he'd start walking normally.
Then he started pulling and pulling, even with me telling him to stop he wouldn't stop until the dog was rather far away.
Now he pulls me to the dog and if I try to pull him back he lays down on the floor and after a while starts pulling me towards the other dog again.

This is just an example of how much he's changing, I don't think it's something to do with his past since he was ok before with other dogs. I haven't done anything wrong with the dog to cause him to ''hate'' other dogs either so I'm not sure why he attacks other dogs when he didn't use to... I've watched some dog whisperer episodes and on one of them episodes Dog Whisperer said about dogs trying to protect their owners when other dogs are around, so I was thinking he might get ''jealous'' or ''feels threaten'' when another dog comes closer and closer to me and my girlfriend (we are the two people who spend every day with him and walk him everywhere). What you think? Could it be that he's just trying to protect us?

You haven't had him long & he's still settling in, really. He gets on ok with your lab because that's his 'partner' at home, whereas strange dogs are considered, well, strange.

If I were you, I'd try and buy a long line for when you're out...
http://www.ebay.co.uk/itm/80ft-LONG-DOG-HORSE-TRAINING-TRACKING-LEAD-IN-VARIOUS-COLOURS-SIZE-LARGE-/230783507719?pt=UK_Pet_Supplies_Dogs&var=&hash=item35bbc4dd07
...let the lead trail, but always make sure you are within easy reach of the end. Then, if your dog doesn't come back immediately you call him you can grab the lead & reel him in! That way he can run about freely, but you still have control.

Also, if you want to socialise him, don't just let him 'sniff & play'! Ask the other owner if they will walk with you for a while, both dogs on lead & on the outside of you both. When they are comfortable with that, let one dog walk between you & if that goes ok try walking the dogs next to each other, but still on lead. Only once you're sure they're ok should you let them play.

Do you feel anxious when you see another dog near? Are you 'expecting the worse'? If so, he could be picking up your anxiety & will be anxious himself. Try to take some deep, calming breaths when you see a dog & distract Dragon with treats or some basic obedience commands.

As Jstaff says, some staffs just don't like other dogs (other than the ones they live with) so you may have to be prepared for that.

Please don't take too much notice of what the Dog Whisperer says - his methods are outdated & often harmful.

That is possible even more so if he is sensing that you are nervous or unsure of a situation. Sometimes at that age they have a shift in personality out of nowhere. You could try keeping some high value treats on you and using them as distractions.

Thank you guys.
I've got to be honest I was always ''scared'' of dogs because when I was little I had bad experience with dogs and any type of dog use to scare me until I got Dragon, he's kinda been changing the way I use to look at dogs and he's been the only dog that I ever liked and played with, so I hardly have any experience with dogs, although I spend most of my time either with Dragon and my girlfriend playing or watching youtube video about dogs, so I start to understand more what to do and what not to do, so with what you guys have said to me, I'm sure somehow I'll be able to make Dragon a better dog.

I was thinking about getting my girlfriend's sister's dog (which is also a staffy, a 4 year old staffy) and walk them two together and try get them to play with each other, Dragon does need a friend to play with outside since the Lab I have isn't really my Lab, it's my mum's Lab and he;s obese so he can't go for long walks or really play outside, he once tried to go for a long-ish walk and he started bleeding from his pours, he was the fattest of all the puppies and his dad was a big dog too, so yea Dragon needs a play mate to play with outside.

Just take it slowly & keep yourself calm (that's important) and hopefully he'll be ok. I wouldn't let him play with a toy when he's with other dogs, though (ball throwing etc) as possessiveness could cause problems.

Learning body language is important and here is a link to help

http://staffy-bull-terrier.co.uk/dogbodylanguage.html