Foals (Birth to 12 Months)
Foals are the exception to low-frequency deworming. Their immune systems are immature, and they are vulnerable to specific parasites such as ascarids.
Foals typically require more frequent, carefully timed treatments, guided by a veterinarian. This schedule gradually tapers as immunity develops.
Yearlings and Young Horses (1–3 Years)
Young horses still carry higher parasite loads than mature adults. Deworming frequency usually decreases during this stage but remains higher than for fully mature horses.
Fecal testing becomes especially useful here to avoid unnecessary treatments.
Adult Horses (4–15 Years)
Most adult horses are low shedders. Many only need one or two deworming treatments per year, often timed for spring and fall.
This is the group most commonly over-dewormed in the past.
Senior Horses (15+ Years)
Older horses may experience immune changes that affect parasite resistance. Some seniors remain low shedders, while others benefit from closer monitoring.
Testing—not age alone—should guide treatment decisions.
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