Miniature Pet Pigs | Merck Veterinary Manual
As healthy, neutered MPPs mature, some become more aggressive and threaten people. No one fully understands why this happens in some cases; however, inadequate opportunities for normal social interactions with other pigs may be a contributing factor.
Ideally, MPPs should be habituated to wearing a harness and walking on a leash while still very young and small. The pig should be taught cues for some basic behaviors (i.e. sitting). Teaching the pig to ask for something with a cued behavior before getting what it wants is one method of teaching the pig that it cannot demand things with aggression.
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