03/10/2026
Yellow dots on your horse’s legs may look harmless, but they are often botfly eggs.
Botflies (Gasterophilus intestinalis) lay their eggs on a horse’s hair during the warmer months. When horses groom themselves, the larvae can enter the mouth and eventually migrate to the stomach, where they develop for several months.
Many horses show few signs, which is why botfly infections can easily go unnoticed.
Regularly checking your horse for botfly eggs and removing them from the coat can help interrupt the parasite’s life cycle and reduce exposure. Strategic deworming with products such as ivermectin or moxidectin after the first frost is also commonly recommended to target larvae in the stomach.
Work with your veterinarian to develop a deworming protocol that addresses all parasites your horse may be at risk for based on management practices and regional concerns.
Understanding how botflies infect horses can help you take simple steps to protect your horse’s health.
Learn how to identify botfly eggs, understand their life cycle, and manage exposure in the full guide:
🇺🇸 https://madbarn.com/botflies-in-horses/
🇨🇦 https://madbarn.ca/botflies-in-horses/
Save this post so you know what to look for the next time you see yellow dots on your horse’s coat.