How do I introduce a male Dog to another male dog?

Question
I have a staffishire Terrier male, not nutered, who was  living at a house that i recently moved out of after a year, but my boy friend still lives there so he still comes over with me when I stay there. My boy friend has a new roommate though, who recently brought his male dog over to live there, he also is not nutered, and is a Bull Mastiff/Pit Bull both dogs are about 2 years of age. Im scared that if I bring him over there, that there will be conflict. The owner of the dog says that he is a sweet heart and if there is conflict that it will be my dog. My dog has been in a fight before and that fight was instigated by my dog. But in the past he has always been passive with other dogs. Im really confused and I still want to be able to bring my dog over there..help me! What do i do?

Answer
Hi Lauren,

It would be a big help, if all involved would have their dogs neitered!

Here is the info you requested about how to introduce the two dogs:

http://www.naturaldogblog.com/blog/2007/09/dog-training-how-to-introduce-your-do...

http://ezinearticles.com/?Introducing-Two-Dogs---Have-a-Safe-Introduction&id=240...

Best of luck,
Patti