10/03/2026
This summer’s extreme heat and drought were hard on our pastures—and even harder on our horses. Three problems dominated our call list: founder, malnutrition, and equine allergies. Today, we’re focusing on why so many horses, ponies, and donkeys were foundering even when the pastures looked dead and “had no grass.”
Horses, ponies, and donkeys with PPID and/or insulin dysregulation are at significantly higher risk of laminitis when non structural carbohydrates (NSC) and sugars rise in pasture plants. Even when the pasture appears brown, sparse, or dormant, stressed forage can carry dangerously high sugar levels.
Grass spikes in sugar during three key situations:
1. Rapid spring growth – when grass is producing energy faster than it can use it.
2. Drought stress – when grass is crispy, dry, and struggling; plants store sugar because they cannot grow.
3. After dormancy followed by rain – when grass “wakes up” suddenly and floods itself with sugars to restart growth.
This means that “no grass” does not equal “no sugar.” Drought stressed pastures can be some of the highest risk environments for horses with PPID or insulin dysregulation, and this summer’s conditions created the perfect storm for laminitis across our region.
Laminitis/founder can show up in several keyways.
Common signs of founder include increased digital pulses, rocking back to relieve pressure, pumping or shifting legs, lying down more than usual, reluctance to move forward, and walking on the heel instead of the toe. Any of these behaviors indicate significant hoof pain.
If you notice these signs, call your veterinarian immediately.
Your vet will perform a full physical exam and evaluate your horse’s diet, pasture access, and overall husbandry. A baseline CBC/chemistry panel, endocrine testing, and radiographs help determine the degree of inflammation and any rotation or sinking of the coffin bone.
Once your veterinary team has a complete picture, they can establish an appropriate treatment plan and management protocol.
Horses with PPID and/or insulin dysregulation require lifelong management.
A coordinated team—owner, veterinarian, and farrier working together—is essential for keeping these horses comfortable and preventing future laminitic episodes.