I do not have any pets right now, but I used to have a pit bull
They're the type of dog breed right? The muscular ones?
Yes, they are definitely known for their strength.  A lot of people are scared of them because they think they are meaner.  They are really sweet, just very strong so they can hurt worse than others if they bite.
Right! My friend had one of the formal breeds, the North American Pit Bull Terrier. It was so cute and playful!
Yes, mine was a "red nose" named Sonny Red.  He was so sweet.  But had terrible separation anxiety.  He used to tear the house up BAD
That's sad, although not surprising they are a little aggressive. They were originally bred as fighting dogs!. 
I thought they were originally bred to actually be in the bull-pits...with during bullfights in Spain.  They were strong enough to help keep the bulls in line.
Wow, I didn't know that! Apparently dog fighting still exists in underground communities...
Yes, dog fighting is HORRIBLE and lots of people do use them for that.  But they use all kinds of breeds, really.  It's terrible.  Remember Michael Vick's story?!
No, I don't. He was the American football quarterback? What happened with him?