Original radiographs are a part of the medical record and as such, normally stay with the DVM (and how long is dictated by state statutes - anywhere from 3-7 years). If you paid for the exam/radiographs, you are entitled to a copy, like Simkie said.
My vets automatically give their clients the X-rays (or any images taken) on a CD before they leave. Granted it is a hospital but the field vets will get you copies once they get back to the clinic. I had recent X-rays done and asked if they could put the ones they took six years ago on the CD too and they gladly did (good to see the changes on my mare over the years).
"When a horse greets you with a nicker & regards you with a large & liquid eye, the question of where you want to be & what you want to do has been answered."CANTER New England
I'm not sure where you guys live, but I'm looking for a new vet. I was trying to keep this one because she vetted my horse and knows his issues, but she's very hard to get a hold of and is unresponsive to me. I hate to think what would happened if I needed her in an emergency - it's a bit frustrating.