A DVM doing research without a PhD is EXTREMELY rare. I have not seen a single job advertised, ever, to that effect. They do exist, but that's a very long road.
If you want to do real research, or ever hope to me more than a consultant, or work in academic or high-end institutions, they want you to have a PhD. Period. And having a DVM in addition to one doesn't give you any perks, when they can just hire a plain old PhD and pay them less. A DVM/PhD is really not worth any more than a PhD to the vast majority of PIs.
Sorry. I'm a tad bitter on the subject. The demand is very low, especially in today's economy. Friends of mine with DVMs, PhDs, and board certification can't find jobs. It was very "in style" for a while to tout how research needs more DVMs blah blah...but in reality, they don't.
They would much rather have a PhD who is just as knowledgeable and skilled in their research arena (if not more) and not have to shell out for a more "expensive" DVM/PhD. A DVM is considered and clinical degree - rather useless in most high tech labs unless you also have board certification in lab animal or pathology (ie, the two most useful specialties to translational medicine as the non-DVM folk see it)
If you REALLY want to do it, look for a program that does NOT combine year. Ie, go to vet school for two years, do your PhD, and come back. You'll forget everything.
Network as much as possible. The DVM/PhD niche is so small, that you need to know people to know people. Network, network, network.
Talk to people at NIH. That's probably the most accessible hub of DVM/PhDs.