My mom rescued her dog Pepsi from being PTS because she had bit two people in her two years of life. The owners were required to either find her a home outside the city limits or she would be put down. After asking questions to the owners we discovered she bit these people when she had puppies. One bite per litter. Well duh! She was protecting her puppies. The people were just walking past the house when she ran out and bit them.
So, my mom only agreed to take her if they got her fixed. The owners gave us a muzzle to use when we take her to the vet. My mom has NEVER used it. We do know that she is not good with small children though. And apparently my niece forgot this and let her out while her little cousin was there and he got bit. My niece got in BIG trouble for this, not to mention she probably already felt bad enough.
So Pepsi was labeled "aggresive" but she now leads a very healthy happy life out in the country and gets LOTS of exercise everyday.
The only reason my parents agreed to take her was because of the circumstances and the fact that it wasn't HER fault she bit, it was the irresponsible owners.

Great thread Sophie! You know what I am going through with Zoee. Some might think she is aggresive. I like reactive better.