Unicorns are a touchy subject.  They can be a lot of fun when they produce but they only have a one in five chance of producing a unicorn foal and that's only if you breed them properly.  Here are the details:

Both parents must be unicorns of the same breed and the breeding can only take place at an assigned time that lasts for one minute twice a day.  You must also wait at least 10 hours between coverings.

I am currently breeding Gypsy Vanner Unicorns.  I think they are gorgeous, I am so glad Howrse brought Gypsy Vanners to the game.  Here are my Unicorns.

     I Will Be Dust                                      I Will Be Queen
~of Dex's Diamonds~                            ~of Dex's Diamonds~

                                  

      I Will Be Uni                                       Queen Nefirtiti
~of Dex's Diamonds~                           ~of Dex's Diamonds~
                                 

     I Will Be King                                     Leverage of Dust
~of Dex's Diamonds~                            ~of Dex's Diamonds~
                                  

         Uni King                                            Will I Be King?
~of Dex's Diamonds~                            ~of Dex's Diamond~