PPID, or Cushing’s Disease, is slowly progressive even in treated horses, writes Eleanor Kellon, VMD. She says the disease weakens the immune response, including waning immunity to intestinal parasites.
For horse owners who may deworm horses twice a year, their PPID horse may still have long periods of parasite damage. The density also builds up in their environment.
Source: American Farriers Journal, March 26, 2026. Link. Audio [2:55]
Even ascarids (Parascarus equorum) which are typically found only in foals, can become a problem for horses with PPID when their adult immunity to them fails.”
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