The answer may surprise you.
How intestinal parasites can damage other body organs
A case in point: Roundworms (ascarids)
Immature roundworm larvae can migrate from the intestine to the liver and lungs, potentially causing tissue damage and signs of respiratory disease.
As a result of the tissue damage, the infected horse may be more susceptible to secondary bacterial pneumonia.
Roundworms find their way back to the intestines, where they lay eggs that pass in the horse's feces, further contaminating the environment.
Parasite eggs and larvae are out there. Shed in the feces of infected animals, they contaminate the environment, where some of them can remain infective for years, even under harsh weather conditions.
And they're waiting for a chance to find their way into your horse.
The very thought of your horse harbouring these unwelcome "guests" can be distressing to you. And with good reason.
Internal parasites can:
Even in the absence of overt symptoms, your horse can be infected and contribute to the spread of eggs in the environment – in addition to being at risk of developing the health problems associated with internal parasites.
Keep reading! Then, be sure to consult your veterinarian.