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Equine Spay - Taming The "Nightmare"

My mare Fiddle was way beyond mareish. Her heat cycles made her uncomfortable, unhappy, and almost dangerous, especially in springtime. Her nickname at the barn was “The Dragon,” and it was well-deserved.

Author:Dr. Felix Chaosphere
Reviewer:Xander Oddity
Oct 27, 2023843 Shares49.5K Views
My mare Fiddle was way beyond mareish. Her heat cycles made her uncomfortable, unhappy, and almost dangerous, especially in springtime. Her nickname at the barn was “The Dragon,” and it was well-deserved.
What can you do with a “nightmare” who pins her ears, humps her back, and kicks out at anything (or anyone) who comes close?


Breeding is commonly suggested for mares who have a rough cycle. The hormone boost from pregnancy makes many (but not all) mares happy and placid. And at the end of a pregnancy, you get a cute little foal!
This was not a good option for us. Supporting a pregnancy and raising a foal is an expensive prospect, and it’s possible that a daughter of a rough-cycling mare will inherit rough cycles herself. And, of course, a mare may return to her old behavior once the foal is weaned.

Herbal Supplements

Herbal supplements like raspberry leaf (sold as Mare Magic) can help with tension and grumpiness for many mares. Raspberry leaf did help Fiddle’s tension but didn’t fix the entire issue.

Marble Insertion

Marble insertion is an experimental technique that helps some mares. After a thorough reproductive exam, the vet inserted a marble into Fiddle’s feminine regions. Marble insertion suppresses estrus in about 50% of mares. My horse was one of the other 50%.


Regumate works to suppress many heat cycle symptoms and is a good short-term option for rough-cycling mares needed for breeding. Fiddle received Regumate for two years, and it helped quite a lot. However, we needed a long-term answer.

Equine Spay

Equine spayis the solution that finally worked for us. In April 2012, I took my mare for ovariectomy: an equine spay.

The Process

Spaying can be done under local or general anesthesia and by using a vaginal, flank, or ventral incision. Each method has a different cost and a varied set of risks, and some approaches are better than others for removing enlarged or diseased ovaries.
In Fiddle’s case, we opted for a standing surgery with flank incisions. The laparoscopic took about 90 minutes.
On examination, one of her ovaries was deemed “mostly normal.” The other had some cysts—not large enough to alarm the vet prior to surgery, but definitely large enough to cause chronic pain.
Fiddle returned home two days after surgery, and we confined her to a stall for about ten days, with frequent breaks of hand-grazing in the sunshine. She is a calm horse, so we didn’t need additional sedation, although the vet made some available.
Gradually, she returned to normal pasture turnout—in small areas at first, and then to increasingly large spaces.
Seventeen days after surgery, I rode my horse lightly on trails. A working endurance athlete prior to the surgery, Fiddle was still very fit after time off. Our early rides post-surgery were low speed and short duration. Over the following weeks, I increased either speed or distance in each workout—not both on the same day.
Eleven weeks after surgery, with veterinary approval, we entered and completed a one-day fifty-mile endurance ride earning good scores through the entire course. Fiddle competed in long-distance rides for an additional 5 years before retirement and was named “Endurance Standardbred of the Year” in 2015. She is still an active trail and dressage mount.
Spay surgery isn’t cheap, and it isn’t completely free of risk. Spaying will not fix problems caused by bad training, poor nutrition, inadequate dental or farrier work, or a too-stressful living situation. But for Fiddle and me, spaying was the best option available.
Years later, Fiddle is still a “dragon”: she is a big, strong, opinionated athlete. However, she is now “the same dragon every day.” Her moods and her comfort are no longer at the mercy of hormone fluctuations. She doesn’t guard her back anymore, and she spends energy moving forward instead of coping with pain. She is quieter, she is kinder, and she is perceptibly happier in the pasture and under saddle.
A friend cringed at the price of surgery, saying that for the cost, I could have gotten a really good horse without the hormone problem. I replied that for the cost, that’s exactly what I got: it just happened to be the really good horse who already lives in my barn.
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Dr. Felix Chaosphere

Dr. Felix Chaosphere

Dr. Felix Chaosphere, a renowned and eccentric psychiatrist, is a master of unraveling the complexities of the human mind. With his wild and untamed hair, he embodies the essence of a brilliant but unconventional thinker. As a sexologist, he fearlessly delves into the depths of human desire and intimacy, unearthing hidden truths and challenging societal norms. Beyond his professional expertise, Dr. Chaosphere is also a celebrated author, renowned for his provocative and thought-provoking literary works. His written words mirror the enigmatic nature of his persona, inviting readers to explore the labyrinthine corridors of the human psyche. With his indomitable spirit and insatiable curiosity, Dr. Chaosphere continues to push boundaries, challenging society's preconceived notions and inspiring others to embrace their own inner tumult.
Xander Oddity

Xander Oddity

Xander Oddity, an eccentric and intrepid news reporter, is a master of unearthing the strange and bizarre. With an insatiable curiosity for the unconventional, Xander ventures into the depths of the unknown, fearlessly pursuing stories that defy conventional explanation. Armed with a vast reservoir of knowledge and experience in the realm of conspiracies, Xander is a seasoned investigator of the extraordinary. Throughout his illustrious career, Xander has built a reputation for delving into the shadows of secrecy and unraveling the enigmatic. With an unyielding determination and an unwavering belief in the power of the bizarre, Xander strives to shed light on the unexplained and challenge the boundaries of conventional wisdom. In his pursuit of the truth, Xander continues to inspire others to question the world around them and embrace the unexpected.
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