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Parasite
Signs
Strongyles
Anemia, dry coat, diarrhea, general loss of condition
Roundworms
Loss of condition, bowel problems, or colic when present in large numbers; migrating roundworm larvae can also injure the lungs in young horses
Pinworms
Horse rubs its tail; itching and irritation around anus; discharge and worms visible around anus
Bots
Loss of condition and colic from large numbers in the gut; occasional diarrhea or constipation
Tapeworms
Mild diarrhea, colic, failure to grow or put on weight as expected
