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Chihuahuas can be excitable and fearful, causing them to become aggressive.
In order to alleviate your dog's aggression, try socializing your dog in a non-threatening situation with other dogs as often as possible. Establish yourself as the pack leader and be firm with your dog. Chihuahuas can be stubborn, but you need to correct your dog at the first sign of each instance of aggressiveness toward another canine.
If you feel you need additional assistance, contact a professional trainer or animal behaviorist who can provide you with additional guidance.