From CNN.COM: 

Okla. vets use maggot therapy on horse

STILLWATER, Okla. - Veterinarians at Oklahoma State University Veterinary Hospital successfully used maggots to clear away dead flesh from a horse that had been bitten by a rattlesnake.

“I’d heard of it being used on people,” said admitting veterinarian Peggy Brosnahan, who had never tried maggot therapy. “When you have a critical case like this, it’s beneficial to be open-minded.”

The 16-month-old filly was bitten on the head by a rattlesnake, causing its neck to swell to five times its normal size.

(more here)