Unicorn

Unicorn is a new creature added to the upcoming The Sims 3: Pets. It was announced for the first time on The Sims 3: Pets - Gamescom Trailer (Germany).

Unicorn is a mystical, magical creature that can be added into any family. There are two kinds of unicorn: Unicorns can not be sold for adoption but have long lives. They can mate and have foals with other unicorns, and even with horses. Unicorn Foals are also possible.
 * Good - Good unicorns bless Sims and help them with gardening.
 * Bad - Bad unicorns curse Sims, bring them bad luck and start fires.

Abilities

 * Teleport
 * Heal
 * Create Fire
 * Bless or Curse plants or Sims

Trivia

 * When unicorns run, they have a glowing, sparkly kind of mist that trails them. Also, when standing still, a rainbow may autonomously shoot from their mane into the sky (this may only be possible with "good" unicorns).
 * Unicorns are possibly the fastest creatures in The Sims series so far, because of their incredibly fast running ability that most pets don't have.