H-FIRE comes to the rescue after a softball-sized tumor threatens the future of a horse in the show ring
New university findings highlight potential implications for equine, treatment, and veterinary practice.
From admissions to the techs and doctors, I can't give them enough credit for their compassion and expertise." At Danika’s initial appointment, the Equine Medical Center team, which included intern Lauren Young and technician Payton Lavoie alongside Ludwig, began Danika on topical treatment to help shrink the mass while they waited for the H-FIRE machine to arrive.
Ask her owner, Carolyn Steppe, and she'll tell you the mare has never had a bad moment in her life — until, that is, a mass developed on the inside of her leg that grew to the size of a tennis ball, threatening to end her show career.
"She is a very social and vocal girl and loves to entertain her humans with a handful of circus tricks," Steppe said.
"She never has a bad moment and is the happiest horse I've ever known — definitely my heart horse." The journey for Danika and Steppe would lead to the Marion duPont Scott Equine Medical Center in Leesburg, one of three teaching hospitals and animal healthcare facilities of the Virginia-Maryland College of Veterinary Medicine, where Danika would receive a variety of advanced treatments, including H-FIRE, or high-frequency irreversible electroporation, a procedure that uses targeted electrical pulses to open pores in tumor cell walls.
Steppe bred and trained Danika herself, a Zweibrucker, which is a type of German warmblood.
For most of the mare's career, she competed in dressage, with jumping and trail rides on the side.
Then, in the fall of 2025, a sarcoid developed on Danika's right hind leg.
The mass was surgically removed, but it grew back larger and more aggressive than before.
"When it happens, you feel so hopeless," Steppe said.
For 17 years, Danika had been more than a competition partner to Steppe, who shared that she turned nearly every stranger who met her into a fan.
A tumor that ate into muscle tissue and threatened her soundness wasn't just a medical problem; it was a threat to the life the two of them had built together.
The report adds to ongoing university-led research relevant to veterinary medicine, animal health, and clinical decision-making.
Source university website: Virginia-Maryland College of Veterinary Medicine
https://news.vt.edu/articles/2026/08/vetmed-emc-success-story-danika.html
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