Equine
Solutions that help maintain and improve the health and welfare of horses.
Supporting Horse Health and the Equine Community
Merck Animal Health is dedicated to developing innovative products and providing trusted services that meet the core health needs of horses, including protection against diseases, treatment of internal parasites, and reproduction management.
We’re proud to partner with members of the equine community to keep horses healthy and active.
Horses
Mares
Ponies
Foals
Our Solutions
Vaccines
Disease Prevention that Supports Horse Well-being
Routine vaccination is an important aspect of equine healthcare, protecting horses from infectious diseases including tetanus, equine influenza, equine herpes, West Nile, strangles, and equine encephalomyelitis. From the breeding barn to the show ring and everything in between, we have a broad range of vaccines that help protect horses in every environment.
Therapeutics
Health Management for Comfortable Lives
Whether treating pain in horses or managing reproduction in mares, we offer therapeutic solutions that improve the health and well-being of horses.
Pain Management
We develop effective pain management solutions to alleviate pain and discomfort due to conditions like musculoskeletal disorders and colic.
Reproduction
During the estrus cycle, some mares can show unruly, aggressive, or dangerous behavior. Our leading reproductive health solutions can help to reduce undesirable behavioral changes while offering greater control and management of the reproductive cycle
Parasiticides
Parasite Control that Keeps Horses Healthy
While parasites are a normal part of a horse’s intestinal flora, some parasites can cause disease when horses don’t receive routine preventive treatments. An equine intestinal parasite management program should include veterinary care, diagnostics, treatment, monitoring and pasture management.
Our parasite solutions kill nematode eggs (ovicidal), and treat and control adult and immature roundworms, encysted mucosal 3rd and 4th stage small strongyle larvae and encysted inhibited 3rd stage small strongyle larvae.
Technology
Tools that Empower the Equine Community
We create digitally connected, cutting-edge technology products that provide horse owners with rich data and insights to help enhance health and quality of life for their horses.
Explore equine stories and insights
New Study Confirms Rapid Action of PROTAZIL® (1.56% diclazuril) Antiprotozoal Pellets for the Treatment of Equine Protozoal Myeloencephalitis (EPM)
Diclazuril reaches therapeutic levels within 12 hours, reinforcing the drug as a first-line EPM treatment option RAHWAY, N.J., September 24, 2025 – Merck Animal Health, known as MSD Animal Health outside of the United States and Canada, a division of Merck & Co., Inc., Rahway, N.J., USA (NYSE:MRK), today announced the results of a new
New Survey Shows Horse Owners Underestimate Disease RisksÂ
As the heart of the spring season unfolds, a concerning trend is emerging in the equine community. A recent survey of American Association of Equine Practitioners (AAEP) members reveals that many horse owners significantly underestimate infectious disease risks and implement only average or below-average biosecurity precautions.
Expert tips for preventing spring respiratory disease outbreaks
Expert tips for preventing spring respiratory disease outbreaks RAHWAY, N.J., February 11, 2025 – As winter transitions to spring, horse owners and barn managers should be on alert for equine influenza (EIV), a highly contagious respiratory disease that has historically surged during this time of year (see figure 1). Recent biosurveillance data underscores this seasonal
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