Please check out the Medical Website Links category. Three relatively new (and apparently successful) surgery-free corn treatments have been invented. A fourth link shows a photo essay of a corn hulling without anesthesia and tells what to do after a greyhound has had a hulling.
In the Medical & Physiology section in the Corns subsection is an article titled My Thoughts on Corns. It discusses the probable reasons greyhounds get corns in the first place. Makes sense to me.