These are the horse breeds available on Howrse as of 6/30/13 listed by popularity with Arabians, Paints and Thoroughbreds being the most popular. 

Arabian Horse                                 Paint Horse                      
Thoroughbred                                  Friesian                            
Quarter Horse                                  Gypsy Vanner                 
Purebred Spanish Horse                  Appaloosa                       
Hanoverian                                      Irish Hunter                    
Marwari                                           Mustang                          
Shetland                                           Chincoteague Pony        
Austrialian Pony                              Newfoundland Pony      
Standardbred                                   Connemara                     
Welsh                                              Canadian Horse              
Hackney                                          Shagya Arabian              
Lusitano                                          Donkey                           
Fjord                                               Knabstrupper                  
Nokota                                            Brumby                           
Trakehner                                       Curly                                
Morgan                                           Quarter Pony                   
Peruvian Paso                                 Barb                                
Russian Don Horse                        Holsteiner                        

In the Howrse world there are a great many abbreviations that are used by long-time members.  There is definitely a learning curve involved to know what people are talking about.  I've listed the most common ones below but feel free to add any I have missed.  (Only abbreviations related to Howrse will be published.)

• Admin - Administration, Employers of Howrse.
• AL - Apollo's Lyre, a black market item that allows an owner to customize a horse's name. 
• Appy - Appaloosa.
• AT - Aphrodite's Tears, a black market item that raises the IBS of a foal by 50%.
• BC - Bold Characters, when a skill's potential has been achieved the skill is considered bold.
• BLUP - Best Linear Unbiassed Potential, BLUP is complicated.  Basically, the higher the BLUP (on a scale of -100 to +100) the better the GP of the foal.  A horse's BLUP rises with training, competitions won and age.
• BM - Black Market Item, special items in the black market that can only be bought with passes, earned in contests or traded for in the item exchange.
• BP - Black Pearl, a special item in the Black Market that is offered occasionally that allows players to create and submit their own designs for Golden Apple coats.
• BUMP - Bring Up My Post, a way of getting your topic back up to the top in the forums in case nobody is responding (use with caution, too much use and you can be sanctioned).
• CT - Chronos Timer, a black market item that allows an owner to train their horse twice as fast.
• EC - Equestrian Center, after a player reaches 20 days' seniority they can create and run their own equestrian center where they can board horses, plant crops, etc.
• FW - Fertility Wand, a black market item that causes a mare to have twins.
• GA - Golden Apple, a black market item that allows an owner to place a special coat on their horse.  The Golden Apple also extends bonuses for competitions.
• GMT - Greenwich Mean Time, the time that the game is in.
• GP - Genetic Potential, a number assigned to all horses when they are born based on the Genetic Potential, Skills and BLUP of the parents.
• GV - Gypsy Vanner.
• HoP or HOP - Horn of Plenty, a black market item that gives you random items for your horse.
• IBS - Inborn Skills, skills a foal has when they are born.  The higher the GP, skills and BLUP of the parents, the higher the Inborn Skills.
• IS - Innate Skills, also known as Inborn Skills.
• MA - Morpheus Arms, a black market item that allows the owner to age their horse indefinitely without the use of aging points.
• MB - Medusa's Blood, a black market item that turns a regular horse into a pegasus.
• Mod(s) - Moderators, players with high seniority that have a great deal of game knowledge and are active players are sometimes asked by Howrse Administration to be moderators in forums.  They watch the forums and other areas to make sure all players are following the rules.
• Newf - Newfoundland Pony.
• NIB - Non-Inbred, a horse that can trace it's lineage back to Ouranos and Gaia without any duplications in Mare or Stallion breeding.
• OT - Official Topic, a topic posted by an Admin or Mod that is found at the top of the forum.
• PB - Purebred, an animal that is 100% one breed.
• Peggy or Peg - Pegasus, a horse with wings, obtained by placing Medusa's Blood on a horse.
• PM - Private Message, a message between two players sent through private mail.
• PoC or POC - Piece of Cloud, a black market item that brings your horse back 4 months and credits you 2 aging points.
• Prego - Pregnant, a mare carrying a foal.
• PSH - Purebred Spanish Horse.
• PStone or PS - Philosopher's Stone, a BM item that makes a horse eternal when placed on the horse.
• QH - Quarter Horse.
• QP - Quarter Pony.
• RC - Retired Coat, a Golden Apple coat that is no longer available to purchase with a Golden Apple.  Is shown by a silver apple on the horse's page.
• RI - Riding Instructor, one of the jobs available in the equestrian centers.
• SDB or SB - Standardbred.
• Stally - Stallion, male horse that can breed.
• TB - Thoroughbred.
• Uni - Unicorn, a horse with a horn, the horn gives the horse a dressage bonus.
• WoY - Water of Youth, a black market item that causes a horse to age by one month every time they age instead of two months.
• ZBolt - Zeus' Lightning Bolt, a black market item that changes the gender of the horse.

There are probably many other abbreviations that I have not covered.  Feel free to add to this list.  Hope this helps.

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~
                                  


      

Howrse has been having tons of contests lately.  I love them because I don't pay real money for passes so the contests are how I get all of my black market items. 

(side note - black market items are special items to enhance your game that cost passes.  Passes can be earned on the game or you can buy them for real money.)

Anyway, some people don't like all of the contests.  I don't understand why.  I mean, if you don't like the contests then just don't participate in them.  It isn't required to participate in the contests. 

For example, right now they are running the Lottery.  You can get tickets several different ways, ie buying them with howrse money (equus), winning 1st place in competitions, getting them from friends.  The winnings from tickets include everything from equus to black market items to special horses.  Here's the list of items you can win in the lottery:

With each ticket you can win one of these prizes...

Mercury Mercury is part of the Solar system horses. Take him for a ride in a black hole to increase his skills. He brings you 1 diamond every time the date is a prime number provided you logged in within the past 3 days.
Falabella	Pack of 3 passes

1 months of Pegasus account subscription	1 x Themis' Scale	1 x Morpheus' Arms
1 x Horn of Plenty	1 x Harmony Pack	1 x Philosopher's Stone
1 x Bonus Pack	1 x Medusa's Blood	1 x Helios' Ray
5 x Diamond	3 x Diamond	1 x Diamond
1 x Zeus' Lightning Bolt	10 000 Equus	5 000 Equus
1 000 Equus	400 Equus	200 Equus
A horse of the Curly breed	1 x Ploutos' Parchment	Ow's congratulations
50 x stars	20 x stars	10 x stars
5 x stars	4 x stars	3 x stars
2 x stars	3 tickets for the next draw	2 tickets for the next draw
1 ticket for the next draw	3 x Aging point	2 x Aging point
1 x Aging point	100 x Apple	1 x Daphne's Laurels
1 x Seahorse	1 x Philotes' Stroke	1 x Croesus' Fortune
1 x Achilles' Heel	1 x Eolus' Wind	1 x Black Orchid
1 x Pandora's Box

So if you like contests then go ahead and play the lottery.  You're bound to win something great.  And if you don't like contests then just go on playing the game the way you prefer but don't ruin it for the rest of us.

For more information about Horwse or to begin playing click here.