Pumpkin was first time sick, since we have known her, after eating too many carrots. That was our big mistake not only because of a sugar they contain but because of what they can cause: Colic. To be honest with you, we did not know it at that time and, in fact, we knew practically nothing about donkeys.
Her another problem later on, linked to conditions of her hooves and returning time to time back, was infection in one of her front feet: Abscess. Pumpkin was laying down on the ground in pain, she couldn't get up and after each try she just collapsed. Weather was bad, cold December 2001, and no shelter... The owner finally called a veterinarian after 10 days when abscess reached her knee, and when I agreed to pay for the treatment.
It was my Christmas gift for Pumpkin. The best one she could possibly get. The treatment she badly needed! It took Pumpkin about three months to fully recover in a stall of former equine (now small animal) hospital where her owner worked.