Miniature pinschers are notoriously aggressive. Their assertive personality is considered to be a breed characteristic and something potential purchasers are told to take into consideration before selecting to bring home a miniature pinscher puppy. It is not unusual or surprising for a poorly trained or untrained min pin to bite but it is certainly unpleasant. As the owner of a minature pinscher you need to be aware of your dog's predisposition toward aggression and work to both curb the behavior and prevent situations where another person or animal could be injured.
Exercise your miniature pinscher on a daily basis. Min pins were bred to chase down small prey and kill them. These dogs want to run and can get more aggressive without exercise. Your dog needs more exercise than just a 20-minute walk around the block every day. Schedule hours of activity for him or pay a doggie day care or dog walker to suit his physical needs.
Socialize your miniature pinscher extensively. Miniature pinschers are generally a suspicious and territorial breed and your dog likely will feel threatened when other dogs or people approach anything he views as being his. You need to spend lots of time teaching your dog to accept other people and other animals, though you need to be aware that no amount of socialization is going to completely eliminate his natural impulses and behaviors.
Enroll your dog in obedience school with a trainer who is accustomed to working with the miniature pinschers unique personality. These dogs tend to be dominant with humans and other dogs. You may need to teach him to respect your authority.
Keep your miniature pinscher contained at all times. Miniature pinschers are notorious escape artists so you need to have a fence he cannot crawl under, through or climb over. When your dog is out in public, he needs to be on a harness and leash. If you are unsure of your ability to prevent your dog from biting, you need to muzzle him.
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