09/08/2026
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Outside temperatures might still feel like summer, but we’re already seeing the start of fall laminitis cases.
There is an uptick in the incidence of laminitis in fall because cooler weather stimulates the grass back into active growth phase which produces a higher concentration of non-structural carbohydrates (starch and sugars). This increase in NSC intake drives blood insulin levels higher in horses with metabolic disease or insulin dysregulation which leads to laminitis.
Fall is also the time when a horse’s pituitary gland secretes increased levels of the hormone ACTH to help prepare their body for winter. In horses with PPID, their pituitary lacks proper regulation and they often have an exaggerated secretion of ACTH which can also result in insulin dysregulation.
Some tips to help prevent laminitis from affecting your horse this fall:
🔹If your horse is in their teens or older and hasn’t had recent bloodwork to screen for PPID, now is a good time to test and see what their baseline hormone levels are.
🔹 If your horse has PPID, we recommend running bloodwork at least yearly to make sure they are being well controlled on their current dosages of medication.
🔹We also recommend checking insulin and glucose levels at least yearly on *any* horse who is overweight or has a history of laminitis to gauge how at-risk they are.
🔹 Horses with known insulin dysregulation or a history of laminitis should have access to fall grass strictly limited. For some horses this means wearing a grazing muzzle and others no access to fall grass at all. Your vet can help guide your horse’s individual needs.
🔹 Potomac Horse Fever is a disease we see in this region that can cause laminitis in addition to diarrhea and fever. Due to the lifecycle of the insects that spread PHF, the majority of cases happen in late summer and fall. We recommend all horses in central Indiana be vaccinated for PHF, and that a booster be administered in the summer-fall timeframe.
Laminitis sucks. Sometimes you can do everyone right and it still happens, but these tips can help mitigate risk as we head into fall! 🍁🍂