"Why go to Germany when you can find a filly like this right here."

Everyone should have a KIS!



Horses now offered for sale by KIS.

We are now going to focus on supporting Rosall's performance and breeding career while offering Rosall and Donavan frozen semen for sale.
Below are horses we have a relationship with, that are for sale. Some bred/owned by Kent Island Sporthorses and others we are helping others to sell. 

We will continue to offer semen for breeding  outside mares to our wonderful Stallions;


To look at horses previously sold from our website, please click here

Please  request video of horses for sale. Wendycos@gmail.com.



We will help you find a Rosall or Donavan offspring for sale:  Also you may contact Steve English at English Sporthorses, in Little Rock , AK., Terry Blair in Georgia, Aimee Boyer in MA  or Florida, Call me for  information. Wendy Costello 443-249-3566

Jill Costello, our daughter in Oklahoma now, has begun her breeding program , and at this time offers in utero a Donavan foal out of her lovely mare Lolita. Also a Sinatra Song (Sandro Hit) Foal out of her Hanoverian mare Liliahn by Loerke (Lauries Crusador) was just  born .. June 18.  More information to follow. Call to inquire: Wendy Costello, 443-249-3566; or Jill Costello, 903-434-9450.


Rosalie KIS,  2010 Oldenburg  mare , for Competition  and Breeding.

Begun under saddle with Team Tate Dressage and continuing with Katie Straton in Maryland. see more videos on FB page: Wendy Winett Costello
Rosalie KIS, 16.1h, Premium Oldenburg foal, started winning blue ribbons as a Yearling at Devon, GOV Individual Breed class . Then each year following finished either 2nd or 3rd in the same class with increasingly impressive scores. IN 2015 she placed 4th in 5 year old Materiale class and Suitability under saddle. Rosie is modern, refined, a very reasonable young mare. Her sire Rosall, known for world class Dressage gaits as well as Hunter talent, won his 30 day test in Germany and the Oldenburg NA stallion testing , USA. Her Dam , by Brentano II (stallion of the year in Germany in 2003) is an elite Hanoverian mare, imported from Germany. Rosie is training with Katie Straton, in Mt.Airy , MD. Call for video .

Amateurs and Professionals love her. I bred her, contact me for more photos and to have questions answered. 262-751-6779. Wendycos@gmail.com, or contact Katie Straton​, 410-259-4165 for more information and to make an appointment to meet Rosalie KIS.


Rosalie KIS is approved  for breeding by the American Hanoverian Society.  She is  loved by professionals and amateurs , and turns head with her beauty, and shows much promise for upper levels of Dressage. She has the beauty, size and ability to be a high level mount for a promising teen JR. or Young Ride

PRICE: $35,000.







Little Black (Beauty)

DEMOCRACY KIS , 4 years old. .DOB: 3.26.11

Now for Sale , after a correct and successful start  by Team Tate Dressage

by Donavan out of our Little Black, aka Beauty.  seen at left.

Democracy KIS ( Dempsey)  is a tall ,and very handsome  athletic fellow . See NEWS page.

<See left, "Dempsey", Dressage training with JJ Tate's team.. Promising youngster for Dressage, or eventing!  From a jumping mother, chosen for Jumper Breeding program of the AHS.. call for more information, videos, 443-249-3566; wendycos@gmail.com; $18000.00...before further training.

Democracy KIS ( Dempsey)

Dempsey will make a wonderful Dressage mount, and he shows aptitude and eagerness for jumping.






Roy at 2 years!

IT IS A COLT!! , by Harmony's Rousseau out of our  New Elite Mare, Royal Princess OBX by Royal Prince  out of of Brimming by Banter.  ( see left) Royal Princess is a gorgeous Hanoverian mare. This is her first foal. She was lovely under saddle with JJ Tate, and  earned high marks  as she earned her  Elite Mare status  Spring of 2010. She caught in foal on one try, and produced a spectacular colt who has won his AHS inspection and  The Hassler Dressage Breeders Sweepstakes for a $5000.00 prize. In addition , The Hasslers' sponsors, OWNERS OF ROUSSEAU, BOUGHT  ROY. So congrats to the Malones, so pleased Roy will be at Hassler Dressage to grow up !!





2009 Foals  for Sale   ~  Congrats to the new owners !!

Sinatra Balladeer KIS, "(click on photo for more  pictures of " Song")

SOLD  to LIZ Hattenburg.   2010 AND 2011 winning and placing in hand classes in large breed shows. 2013 , saw Song ( now called Lance, ) in competition and doing so well under saddle!!


2008 foals  for Sale


Paprika KIS: Feminine Han. chestnut, filly by Pablo, out of Atlanta by Aktion, Co- Top Filly of the AHS inspection. Handled Devon so well. . video now on YOU Tube click here      Very special filly.

  SOLD. NOW IN CALIFORNIA   IN JUNE 2011.CONGRATS TO Kelsea and her parents.

Now under saddle in 2012, and  doing nicely!! .

2013 COLT   Special fellow!! Sold

2013 Foal SOLD : By Escudo II, top jumper stallion .out of Little Black , left photo, ( Beauty) Approved TB  with AHS, ISR/Oldenburg NA, and RPSI. See Rainbow Equus Meadows for complete information for Escudo II. See Also on our  outside stallion listings. We have bred to him before with huge success .


Beauty's colt arrived! What a beautiful boy he is !

Etienne, born on  June 8, 2013. 

Exclusive KIS as he was named by his new owner Aimee Boyer of Harmony Farm. in MA, was top Foal at his AHS inspection and also pinned at Dressage at Devon.









Adult Horses for Riding and/or Breeding:  Fairest Possible prices.
FOR SALE--- $28,000.  Will consider negotiation for right program.

Royal Princess OBX; Elite Hanoverian Mare , Dam of  Top Hanoverian Foal

PRINCESS had a gorgeous 2013, chosen by JJ Tate, top FEI Rider.

She is By Royal Prince, and out of Banter mare. (Bolero, Grande lines)

Royal Princess is a dream for any breeder and also will be successful in Dressage or Hunter competition. She  loved her jump tests, and is a pleasure to ride. JJ Tate showed her to her  Elite Mare status.

Princess has had all premium foals  for GOV and also top foal for Hanoverians. Perfect to start your own breeding program with an excellent foundation, or add to an already successful program.


Royal Princess OBX, shown her with handlers as her top foal by Rousseau is pinned at Devon at age of 3 months.  HE also won a huge sweepstakes prize from Hassler Dressage, and was purchased by the Sire's owners.


Princess with her colt by Rosall.. photo by Richard Malmgren.


Royal Princess OBX with JJ Tate up, completing her Mare Performance test and earning her Elite Mare status.

She is a dream to ride, and amateur friendly. Has beauty enough for Hunter  classes, and talent enough to go far in Dressage.