I think aggressiveness is a natural trait of the miniature Pomeranian. Everyone that I know that has ever had one said that they were naturally aggressive toward other people, but not to themselves. However, I had a standard Pomeranian (not common) that was a Teddy Bear - in fact, I named him "Teddy".
Yes, I agree a dog can become aggressive if their mistreated but sometimes dogs are just that way. Just like some people are naturally grumpy or downright mean. I wouldn't be too quick to fault a previous owner.
ANY dog can be aggressive...:) What is the dog doing? I mean is it threatening or actually biting? Here is one of my favorite reference sites for anything dog related. This is an article on Dealing with aggressive dogs...I hope this answers your questions!
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