Poor dog
First of all, NO aggressive dog should ever be bred...he should have been neutered. He's probably aggressive because he was repeatedly attacked by another dog, rehomed, used for breeding, and disliked by his current owner...as well as being an intact male. Dogs aren't born bad...people make them that way. He needs to be neutered and given to someone who will love him and work with him.
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.