Wild boar
A heavy tusked pig of the forest — domestic ancestry gone back to its dangerous wild shape.
A wild boar in a dream is the dream's image of a domestic-looking creature gone fully back to its wild shape. The boar is what the farm pig was before; the tusks and the temper had only been laid down, not removed. The dream brings the wild boar when something in your life — a familiar habit, a tame-looking person, a system you assumed safe — has reverted to a form that is not interested in being managed. A wild boar at a distance through the trees is the dream affirming the sighting and the warning. A wild boar charging on a path is the dream noting that the reversion is complete, and the creature in front of you is not the one you had in mind.