Symptoms of a worm or parasite infection can be quite varied and dependent on the type and number present in a horse. A complicating factor is that a horse may not present with symptoms until the parasite burden is high.  

Some typical symptoms of worms or parasites include: 

• Itching
• Weight loss
• Reduced appetite
• Colic
• Lethargy
• Susceptibility to infections
• Pneumonia 

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