I did a search for “Indiana equine hospital” and got bunch of results (on bing…didnt try google but that would prob be just as good)
doing a search for indiana large animal hospital might work too.
our local horse council has a booklet that they put out each year that lists providers of all kinds of horse things (including vets)
try your ag extension office (usually one per county)
try calling and asking local small animal vets
ask your farrier
here is the link for teh find-a-vet page from the indiana vet medical assoc
good luck-might wanna interview different vets BEFORE you have a major problem! dont want to have them out for an emergency and find out they are incompetent or a jerk…